started retooling with typescript

Tone/core/Connect.ts

@@ -0,0 +1,113 @@
+import { InputNode, OutputNode, ToneAudioNode } from "../node/AudioNode";
+import { isArray, isDefined, isNumber } from "./Util";
+
+/**
+ *  connect together all of the arguments in series
+ *  @param nodes
+ */
+export function connectSeries(...nodes: InputNode[]): void {
+	nodes.reduce((prev, current) => {
+		if (prev instanceof ToneAudioNode || prev instanceof AudioNode) {
+			connect(prev, current);
+		}
+		return current;
+	}, nodes[0]);
+}
+
+/**
+ * Connect two nodes together so that signal flows from the
+ * first node to the second. Optionally specify the input and output channels.
+ * @param srcNode The source node
+ * @param dstNode The destination node
+ * @param outputNumber The output channel of the srcNode
+ * @param inputNumber The input channel of the dstNode
+ */
+export function connect(srcNode: OutputNode, dstNode: InputNode, outputNumber = 0, inputNumber = 0): void {
+
+	// resolve the input of the dstNode
+	while (!(dstNode instanceof AudioNode || dstNode instanceof AudioParam)) {
+		if (isArray(dstNode.input)) {
+			this.assert(dstNode.input.length < inputNumber, "the output number is greater than the number of outputs");
+			dstNode = dstNode.input[inputNumber];
+		} else if (isDefined(dstNode.input)) {
+			dstNode = dstNode.input;
+		}
+		inputNumber = 0;
+	}
+
+	if (srcNode instanceof ToneAudioNode) {
+		if (isArray(srcNode.output)) {
+			this.assert(srcNode.output.length < outputNumber, "the output number is greater than the number of outputs");
+			srcNode = srcNode.output[outputNumber];
+		} else if (isDefined(srcNode.output)) {
+			srcNode = srcNode.output;
+		}
+		outputNumber = 0;
+	}
+
+	// make the connection
+	if (dstNode instanceof AudioParam) {
+		srcNode.connect(dstNode, outputNumber);
+	} else {
+		srcNode.connect(dstNode, outputNumber, inputNumber);
+	}
+}
+
+/**
+ * Disconnect a node from all nodes or optionally include a destination node and input/output channels.
+ * @param srcNode The source node
+ * @param dstNode The destination node
+ * @param outputNumber The output channel of the srcNode
+ * @param inputNumber The input channel of the dstNode
+ */
+export function disconnect(
+	srcNode: OutputNode,
+	dstNode?: InputNode,
+	outputNumber = 0,
+	inputNumber = 0,
+): void {
+
+	// resolve the destination node
+	if (isDefined(dstNode)) {
+		while (dstNode instanceof ToneAudioNode) {
+			if (isArray(dstNode.input)) {
+				if (isNumber(inputNumber)) {
+					this.assert(dstNode.input.length < inputNumber, "the input number is greater than the number of inputs");
+					dstNode = dstNode.input[inputNumber];
+				} else {
+					// disconnect from all of the nodes
+					// since we don't know which one was connected
+					dstNode.input.forEach(dst => {
+						try {
+							// catch errors from disconnecting from nodes that are not connected
+							disconnect(srcNode, dst, outputNumber);
+							// tslint:disable-next-line: no-empty
+						} catch (e) { }
+					});
+				}
+				inputNumber = 0;
+			} else if (dstNode.input) {
+				dstNode = dstNode.input;
+			}
+		}
+	}
+
+	// resolve the src node
+	while (!(srcNode instanceof AudioNode)) {
+		if (isArray(srcNode.output)) {
+			this.assert(srcNode.output.length < outputNumber, "the output number is greater than the number of outputs");
+			srcNode = srcNode.output[outputNumber];
+		} else if (isDefined(srcNode.output)) {
+			srcNode = srcNode.output;
+		}
+		outputNumber = 0;
+	}
+
+	if (dstNode instanceof AudioParam) {
+		srcNode.disconnect(dstNode, outputNumber);
+	} else if (dstNode instanceof AudioNode) {
+		srcNode.disconnect(dstNode, outputNumber, inputNumber);
+	} else {
+		srcNode.disconnect();
+	}
+}

Tone/core/Context.ts

@@ -0,0 +1,379 @@
+import { Ticker, TickerClockSource } from "./ContextTicker";
+import { Emitter } from "./Emitter";
+import { Timeline } from "./Timeline";
+import { isString, Omit, optionsFromArguments } from "./Util";
+
+type ContextLatencyHint = AudioContextLatencyCategory | "fastest";
+
+// these are either not used in Tone.js or deprecated and not implemented.
+type ExcludedFromBaseAudioContext = "createScriptProcessor" | "onstatechange" | "addEventListener"
+	| "removeEventListener" | "listener" | "dispatchEvent" | "audioWorklet";
+
+// the subset of the BaseAudioContext which Tone.Context implements.
+type BaseAudioContextSubset = Omit<BaseAudioContext, ExcludedFromBaseAudioContext>;
+
+interface ContextOptions {
+	clockSource: TickerClockSource;
+	latencyHint: ContextLatencyHint;
+	lookAhead: Seconds;
+	updateInterval: Seconds;
+}
+
+interface ContextTimeoutEvent {
+	callback: (...args: any[]) => void;
+	id: number;
+	time: Seconds;
+}
+
+/**
+ * Wrapper around the native AudioContext.
+ */
+export class Context extends Emitter implements BaseAudioContextSubset {
+
+	name = "Context";
+
+	static getDefaults(): ContextOptions {
+		return {
+			clockSource: "worker",
+			latencyHint: "interactive",
+			lookAhead: 0.1,
+			updateInterval: 0.03,
+		};
+	}
+
+	/**
+	 *  The amount of time into the future events are scheduled
+	 */
+	lookAhead: Seconds;
+
+	/**
+	 * private reference to the BaseAudioContext
+	 */
+	private readonly _context: BaseAudioContext;
+
+	/**
+	 * A reliable callback method
+	 */
+	private readonly _ticker: Ticker;
+
+	/**
+	 *  The default latency hint
+	 */
+	private _latencyHint: ContextLatencyHint | Seconds;
+
+	/**
+	 *  An object containing all of the constants AudioBufferSourceNodes
+	 */
+	private _constants = new Map<number, AudioBufferSourceNode>();
+
+	/**
+	 *  All of the setTimeout events.
+	 */
+	private _timeouts: Timeline<ContextTimeoutEvent>;
+
+	/**
+	 *  The timeout id counter
+	 */
+	private _timeoutIds = 0;
+
+	constructor(context: BaseAudioContext) {
+		super();
+
+		this._context = context;
+
+		const defaults = Context.getDefaults();
+		this._latencyHint = defaults.latencyHint;
+		this.lookAhead = defaults.lookAhead;
+		this._timeouts = new Timeline();
+
+		this._ticker = new Ticker(this.emit.bind(this, "tick"), defaults.clockSource, defaults.updateInterval);
+		this.on("tick", this._timeoutLoop.bind(this));
+
+		// fwd events from the context
+		this._context.addEventListener("statechange", () => {
+			this.emit("statechange", this.state);
+		});
+	}
+
+	///////////////////////////////////////////////////////////////////////
+	// BASE AUDIO CONTEXT METHODS
+	///////////////////////////////////////////////////////////////////////
+
+	createAnalyser(): AnalyserNode {
+		return this._context.createAnalyser();
+	}
+	createOscillator(): OscillatorNode {
+		return this._context.createOscillator();
+	}
+	createBufferSource(): AudioBufferSourceNode {
+		return this._context.createBufferSource();
+	}
+	createBiquadFilter(): BiquadFilterNode {
+		return this._context.createBiquadFilter();
+	}
+	createBuffer(numberOfChannels: number, length: number, sampleRate: number): AudioBuffer {
+		return this._context.createBuffer(numberOfChannels, length, sampleRate);
+	}
+	createChannelMerger(numberOfInputs?: number | undefined): ChannelMergerNode {
+		return this._context.createChannelMerger(numberOfInputs);
+	}
+	createChannelSplitter(numberOfOutputs?: number | undefined): ChannelSplitterNode {
+		return this._context.createChannelSplitter(numberOfOutputs);
+	}
+	createConstantSource(): ConstantSourceNode {
+		return this._context.createConstantSource();
+	}
+	createConvolver(): ConvolverNode {
+		return this._context.createConvolver();
+	}
+	createDelay(maxDelayTime?: number | undefined): DelayNode {
+		return this._context.createDelay(maxDelayTime);
+	}
+	createDynamicsCompressor(): DynamicsCompressorNode {
+		return this._context.createDynamicsCompressor();
+	}
+	createGain(): GainNode {
+		return this._context.createGain();
+	}
+	createIIRFilter(feedforward: number[], feedback: number[]): IIRFilterNode {
+		return this._context.createIIRFilter(feedforward, feedback);
+	}
+	createPanner(): PannerNode {
+		return this._context.createPanner();
+	}
+	createPeriodicWave(
+		real: number[] | Float32Array,
+		imag: number[] | Float32Array,
+		constraints?: PeriodicWaveConstraints | undefined,
+	): PeriodicWave {
+		return this._context.createPeriodicWave(real, imag, constraints);
+	}
+	createStereoPanner(): StereoPannerNode {
+		return this._context.createStereoPanner();
+	}
+	createWaveShaper(): WaveShaperNode {
+		return this._context.createWaveShaper();
+	}
+	decodeAudioData(audioData: ArrayBuffer): Promise<AudioBuffer> {
+		return this._context.decodeAudioData(audioData);
+	}
+	/**
+	 *  The audio output destination. Alias for Tone.Master
+	 */
+	get destination(): AudioDestinationNode {
+		return this._context.destination;
+	}
+	/**
+	 *  The current time in seconds of the AudioContext.
+	 */
+	get currentTime(): Seconds {
+		return this._context.currentTime;
+	}
+	/**
+	 *  The current time in seconds of the AudioContext.
+	 */
+	get state(): AudioContextState {
+		return this._context.state;
+	}
+	/**
+	 *  The current time in seconds of the AudioContext.
+	 */
+	get sampleRate(): number {
+		return this._context.sampleRate;
+	}
+	/**
+	 *  The listener
+	 */
+	get listener(): AudioListener {
+		return this._context.listener;
+	}
+
+	///////////////////////////////////////////////////////////////////////
+	// TICKER
+	///////////////////////////////////////////////////////////////////////
+
+	/**
+	 *  How often the interval callback is invoked.
+	 *  This number corresponds to how responsive the scheduling
+	 *  can be. context.updateInterval + context.lookAhead gives you the
+	 *  total latency between scheduling an event and hearing it.
+	 */
+	get updateInterval(): Seconds {
+		return this._ticker.updateInterval;
+	}
+	set updateInterval(interval: Seconds) {
+		this._ticker.updateInterval = interval;
+	}
+
+	/**
+	 *  What the source of the clock is, either "worker" (Web Worker [default]),
+	 *  "timeout" (setTimeout), or "offline" (none).
+	 */
+	get clockSource(): TickerClockSource {
+		return this._ticker.type;
+	}
+	set clockSource(type: TickerClockSource) {
+		this._ticker.type = type;
+	}
+
+	/**
+	 *  The type of playback, which affects tradeoffs between audio
+	 *  output latency and responsiveness.
+	 *
+	 *  In addition to setting the value in seconds, the latencyHint also
+	 *  accepts the strings "interactive" (prioritizes low latency),
+	 *  "playback" (prioritizes sustained playback), "balanced" (balances
+	 *  latency and performance), and "fastest" (lowest latency, might glitch more often).
+	 *  @example
+	 * //set the lookAhead to 0.3 seconds
+	 * Tone.context.latencyHint = 0.3;
+	 */
+	get latencyHint(): ContextLatencyHint | Seconds {
+		return this._latencyHint;
+	}
+	set latencyHint(hint: ContextLatencyHint | Seconds) {
+		let lookAheadValue = 0;
+		this._latencyHint = hint;
+		if (isString(hint)) {
+			switch (hint) {
+				case "interactive":
+					lookAheadValue = 0.1;
+					break;
+				case "playback":
+					lookAheadValue = 0.8;
+					break;
+				case "balanced":
+					lookAheadValue = 0.25;
+					break;
+				case "fastest":
+					lookAheadValue = 0.01;
+					break;
+			}
+		}
+		this.lookAhead = lookAheadValue;
+		this.updateInterval = lookAheadValue / 3;
+	}
+
+	/**
+	 *  The unwrapped AudioContext.
+	 */
+	get rawContext(): BaseAudioContext {
+		return this._context;
+	}
+
+	/**
+	 *  The current audio context time
+	 */
+	now(): Seconds {
+		return this._context.currentTime + this.lookAhead;
+	}
+
+	/**
+	 *  Starts the audio context from a suspended state. This is required
+	 *  to initially start the AudioContext.
+	 */
+	resume(): Promise<void> {
+		if (this._context.state === "suspended" && this._context instanceof AudioContext) {
+			return this._context.resume();
+		} else {
+			return Promise.resolve();
+		}
+	}
+
+	/**
+	 *  Promise which is invoked when the context is running.
+	 *  Tries to resume the context if it's not started.
+	 *  @return  {Promise}
+	 */
+	async close(): Promise<Context> {
+		if (this._context instanceof AudioContext) {
+			await this._context.close();
+		}
+		return this;
+	}
+
+	/**
+	 *  Generate a looped buffer at some constant value.
+	 */
+	getConstant(val: number): AudioBufferSourceNode {
+		if (this._constants.has(val)) {
+			return this._constants.get(val) as AudioBufferSourceNode;
+		} else {
+			const buffer = this._context.createBuffer(1, 128, this._context.sampleRate);
+			const arr = buffer.getChannelData(0);
+			for (let i = 0; i < arr.length; i++) {
+				arr[i] = val;
+			}
+			const constant = this._context.createBufferSource();
+			constant.channelCount = 1;
+			constant.channelCountMode = "explicit";
+			constant.buffer = buffer;
+			constant.loop = true;
+			constant.start(0);
+			this._constants.set(val, constant);
+			return constant;
+		}
+	}
+
+	/**
+	 *  Clean up. Also closes the audio context.
+	 */
+	dispose(): Context {
+		this._ticker.dispose();
+		this._timeouts.dispose();
+		Object.keys(this._constants).map(val => this._constants[val].disconnect());
+		this.close();
+		return this;
+	}
+
+	///////////////////////////////////////////////////////////////////////
+	// TIMEOUTS
+	///////////////////////////////////////////////////////////////////////
+
+	/**
+	 *  The private loop which keeps track of the context scheduled timeouts
+	 *  Is invoked from the clock source
+	 */
+	private _timeoutLoop(): void  {
+		const now = this.now();
+		let firstEvent = this._timeouts.peek();
+		while (this._timeouts.length && firstEvent && firstEvent.time <= now) {
+			// invoke the callback
+			firstEvent.callback();
+			firstEvent = this._timeouts.peek();
+			// shift the first event off
+			this._timeouts.shift();
+		}
+	}
+
+	/**
+	 *  A setTimeout which is guarented by the clock source.
+	 *  Also runs in the offline context.
+	 *  @param  fn       The callback to invoke
+	 *  @param  timeout  The timeout in seconds
+	 *  @returns ID to use when invoking Context.clearTimeout
+	 */
+	setTimeout(fn: (...args: any[]) => void, timeout: Seconds): number {
+		this._timeoutIds++;
+		const now = this.now();
+		this._timeouts.add({
+			callback : fn,
+			id : this._timeoutIds,
+			time : now + timeout,
+		});
+		return this._timeoutIds;
+	}
+
+	/**
+	 *  Clears a previously scheduled timeout with Tone.context.setTimeout
+	 *  @param  id  The ID returned from setTimeout
+	 */
+	clearTimeout(id: number): Context {
+		this._timeouts.forEach(event => {
+			if (event.id === id) {
+				this._timeouts.remove(event);
+			}
+		});
+		return this;
+	}
+}

Tone/core/ContextTicker.ts

@@ -0,0 +1,146 @@
+
+export type TickerClockSource = "worker" | "timeout" | "offline";
+
+/**
+ * A class which provides a reliable callback using either
+ * a Web Worker, or if that isn't supported, falls back to setTimeout.
+ */
+export class Ticker {
+
+	/**
+	 * Either "worker" or "timeout" or "offline"
+	 */
+	private _type: TickerClockSource;
+
+	/**
+	 * The update interval of the worker
+	 */
+	private _updateInterval: Seconds;
+
+	/**
+	 * The callback to invoke at regular intervals
+	 */
+	private _callback: () => void;
+
+	/**
+	 * track the callback interval
+	 */
+	private _timeout!: number;
+
+	/**
+	 * private reference to the worker
+	 */
+	private _worker!: Worker;
+
+	constructor(callback: () => void, type: TickerClockSource, updateInterval: Seconds) {
+
+		this._callback = callback;
+		this._type = type;
+		this._updateInterval = updateInterval;
+
+		// create the clock source for the first time
+		this._createClock();
+	}
+
+	/**
+	 *  Generate a web worker
+	 */
+	private _createWorker(): void {
+
+		const blob = new Blob([
+			// the initial timeout time
+			`var timeoutTime =  ${(this._updateInterval * 1000).toFixed(1)};
+			// onmessage callback
+			self.onmessage = function(msg){
+				timeoutTime = parseInt(msg.data);
+			};
+			// the tick function which posts a message
+			// and schedules a new tick
+			function tick(){
+				setTimeout(tick, timeoutTime);
+				self.postMessage('tick');
+			}
+			// call tick initially
+			tick();`,
+		]);
+		const blobUrl = window.URL.createObjectURL(blob);
+		const worker = new Worker(blobUrl);
+
+		worker.onmessage = this._callback.bind(this);
+
+		this._worker = worker;
+	}
+
+	/**
+	 * Create a timeout loop
+	 */
+	private _createTimeout(): void {
+		this._timeout = window.setTimeout(()  => {
+			this._createTimeout();
+			this._callback();
+		}, this._updateInterval * 1000);
+	}
+
+	/**
+	 * Create the clock source.
+	 */
+	private _createClock(): void {
+		if (this._type === "worker") {
+			try {
+				this._createWorker();
+			} catch (e) {
+				// workers not supported, fallback to timeout
+				this._type = "timeout";
+				this._createClock();
+			}
+		} else if (this._type === "timeout") {
+			this._createTimeout();
+		}
+	}
+
+	/**
+	 * Clean up the current clock source
+	 */
+	private _disposeClock(): void {
+		if (this._timeout) {
+			clearTimeout(this._timeout);
+			this._timeout = 0;
+		}
+		if (this._worker) {
+			this._worker.terminate();
+			this._worker.onmessage = null;
+		}
+	}
+
+	/**
+	 * The rate in seconds the ticker will update
+	 */
+	get updateInterval(): Seconds {
+		return this._updateInterval;
+	}
+	set updateInterval(interval: Seconds) {
+		this._updateInterval = Math.max(interval, 128 / 44100);
+		if (this._type === "worker") {
+			this._worker.postMessage(Math.max(interval * 1000, 1));
+		}
+	}
+
+	/**
+	 * The type of the ticker, either a worker or a timeout
+	 */
+	get type(): TickerClockSource {
+		return this._type;
+	}
+	set type(type: TickerClockSource) {
+		this._disposeClock();
+		this._type = type;
+		this._createClock();
+	}
+
+	/**
+	 * Clean up
+	 */
+	dispose(): void {
+		this._disposeClock();
+	}
+}

Tone/core/Decorator.ts

@@ -0,0 +1,20 @@
+function optionsFromArguments<Options>(defaults: Options, args: any[], keys: string[]): Options {
+	return defaults;
+}
+
+type ObjectConstructor = new (...args: any[]) => {};
+
+export function useDefaultsAndArguments<DefaultOptions>(
+	defaults: DefaultOptions,
+	optionsOrder: string[],
+) {
+	return <T extends ObjectConstructor>(classDef: T) => {
+		return class extends classDef {
+			// assign the instance defaults
+			defaults: DefaultOptions = defaults;
+			constructor(...args: any[]) {
+				super(optionsFromArguments(defaults, args, optionsOrder));
+			}
+		};
+	};
+}

Tone/core/Emitter.ts

@@ -0,0 +1,120 @@
+import { Tone } from "./Tone";
+import { isUndef } from "./Util";
+
+interface EventObject {
+	[event: string]: Array<(...args: any[]) => void>;
+}
+
+/**
+ * Emitter gives classes which extend it
+ * the ability to listen for and emit events.
+ * Inspiration and reference from Jerome Etienne's [MicroEvent](https://github.com/jeromeetienne/microevent.js).
+ * MIT (c) 2011 Jerome Etienne.
+ */
+export class Emitter extends Tone {
+
+	name = "Emitter";
+
+	/**
+	 * Private container for the events
+	 */
+	private _events: EventObject = {};
+
+	/**
+	 *  Bind a callback to a specific event.
+	 *  @param  event     The name of the event to listen for.
+	 *  @param  callback  The callback to invoke when the event is emitted
+	 */
+	on(event: string, callback: (...args: any[]) => void): Emitter {
+		// split the event
+		const events = event.split(/\W+/);
+		events.forEach(eventName => {
+			if (!this._events.hasOwnProperty(eventName)) {
+				this._events[eventName] = [];
+			}
+			this._events[eventName].push(callback);
+		});
+		return this;
+	}
+
+	/**
+	 *  Bind a callback which is only invoked once
+	 *  @param  event     The name of the event to listen for.
+	 *  @param  callback  The callback to invoke when the event is emitted
+	 */
+	once(event: string, callback: (...args: any[]) => void): Emitter {
+		const boundCallback = (...args: any[])  => {
+			// invoke the callback
+			callback(...args);
+			// remove the event
+			this.off(event, boundCallback);
+		};
+		this.on(event, boundCallback);
+		return this;
+	}
+
+	/**
+	 *  Remove the event listener.
+	 *  @param  event     The event to stop listening to.
+	 *  @param  callback  The callback which was bound to the event with Emitter.on.
+	 *                    If no callback is given, all callbacks events are removed.
+	 */
+	off(event: string, callback?: (...args: any[]) => void): Emitter {
+		const events = event.split(/\W+/);
+		events.forEach(eventName => {
+			if (this._events.hasOwnProperty(event)) {
+				if (isUndef(callback)) {
+					this._events[event] = [];
+				} else {
+					const eventList = this._events[event];
+					for (let i = 0; i < eventList.length; i++) {
+						if (eventList[i] === callback) {
+							eventList.splice(i, 1);
+						}
+					}
+				}
+			}
+		});
+		return this;
+	}
+
+	/**
+	 *  Invoke all of the callbacks bound to the event
+	 *  with any arguments passed in.
+	 *  @param  event  The name of the event.
+	 *  @param args The arguments to pass to the functions listening.
+	 */
+	emit(event, ...args: any[]): Emitter {
+		if (this._events) {
+			if (this._events.hasOwnProperty(event)) {
+				const eventList = this._events[event].slice(0);
+				for (let i = 0, len = eventList.length; i < len; i++) {
+					eventList[i].apply(this, args);
+				}
+			}
+		}
+		return this;
+	}
+
+	/**
+	 *  Add Emitter functions (on/off/emit) to the object
+	 */
+	// static mixin(object) {
+	// 	const functions = ["on", "once", "off", "emit"];
+	// 	object._events = {};
+	// 	functions.forEach(func => {
+	// 		const emitterFunc = Emitter.prototype[func];
+	// 		object[func] = emitterFunc;
+	// 	});
+	// 	return Emitter;
+	// }
+
+	/**
+	 *  Clean up
+	 */
+	dispose(): Emitter {
+		this._events = {};
+		return this;
+	}
+}
+

Tone/core/FromContext.ts

@@ -0,0 +1,14 @@
+import { Gain } from "../node/Gain";
+import { isUndef } from "./Util";
+
+export function fromContext(context) {
+	const Tone: any = {};
+	if (isUndef(Gain.prototype.defaultContext)) {
+		Tone.Gain = class extends Gain {
+			get defaultContext() {
+				return context;
+			}
+		};
+	}
+	return Tone;
+}

Tone/core/Global.ts

@@ -0,0 +1,65 @@
+import { isUndef } from "./Util";
+
+/**
+ * The global audio context which is getable and assignable through
+ * getContext and setContext
+ */
+let globalContext: BaseAudioContext;
+
+/**
+ * Returns the default system-wide AudioContext
+ */
+export function getContext(): BaseAudioContext {
+	if (!globalContext) {
+		globalContext = new AudioContext();
+	}
+	return globalContext;
+}
+
+/**
+ * Set the default audio context
+ */
+export function setContext(context: BaseAudioContext): void {
+	globalContext = context;
+}
+
+/**
+ * Most browsers will not play _any_ audio until a user
+ * clicks something (like a play button). Invoke this method
+ * on a click or keypress event handler to start the audio context.
+ * More about the Autoplay policy
+ * [here](https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#webaudio)
+ * @example
+ * document.querySelector('#playbutton').addEventListener('click', () => Tone.start())
+ */
+export function start(): Promise < void> {
+	return globalContext.resume();
+}
+
+/**
+ * True if the current environment has the necessary APIs to run Tone.js
+ */
+// // export const supported: boolean = toneGlobal.hasOwnProperty("Promise") && toneGlobal.hasOwnProperty("AudioContext");
+
+// set the audio context initially, and if one is not already created
+// if (Tone.supported && !Tone.initialized){
+// 	if (!Tone.global.TONE_AUDIO_CONTEXT){
+// 		Tone.global.TONE_AUDIO_CONTEXT = new Context();
+// 	}
+// 	Tone.context = Tone.global.TONE_AUDIO_CONTEXT;
+
+// 	// log on first initialization
+// 	// allow optional silencing of this log
+// 	if (!Tone.global.TONE_SILENCE_LOGGING){
+// 		var prefix = "v";
+// 		if (Tone.version === "dev"){
+// 			prefix = "";
+// 		}
+// 		var printString = " * Tone.js " + prefix + Tone.version + " * ";
+// 		// eslint-disable-next-line no-console
+// 		console.log("%c" + printString, "background: #000; color: #fff");
+// 	}
+// } else if (!Tone.supported && !Tone.global.TONE_SILENCE_LOGGING){
+// 	// eslint-disable-next-line no-console
+// 	console.warn("This browser does not support Tone.js");
+// }

Tone/core/Timeline.ts

@@ -0,0 +1,370 @@
+import { Tone } from "./Tone";
+import { optionsFromArguments } from "./Util";
+
+interface TimelineOptions {
+	memory: number;
+}
+
+/**
+ * An event must have a time number
+ */
+interface TimelineEvent {
+	time: number;
+}
+
+/**
+ *  @class A Timeline class for scheduling and maintaining state
+ *         along a timeline. All events must have a "time" property.
+ *         Internally, events are stored in time order for fast
+ *         retrieval.
+ *  @extends {Tone}
+ *  @param {Positive} [memory=Infinity] The number of previous events that are retained.
+ */
+export class Timeline<GenericEvent extends TimelineEvent> extends Tone {
+
+	name = "Timeline";
+
+	/**
+	 *  The memory of the timeline, i.e.
+	 *  how many events in the past it will retain
+	 */
+	memory: number;
+
+	/**
+	 * The array of scheduled timeline events
+	 */
+	private _timeline: GenericEvent[];
+
+	constructor(options?: Partial<TimelineOptions>);
+	constructor(memory?: number);
+	constructor() {
+		super();
+		const options = optionsFromArguments(Timeline.getDefaults(), arguments, ["memory"]);
+
+		this._timeline = [];
+		this.memory = options.memory;
+	}
+
+	static getDefaults(): TimelineOptions {
+		return {
+			memory: Infinity,
+		};
+	}
+
+	/**
+	 *  The number of items in the timeline.
+	 */
+	get length(): number {
+		return this._timeline.length;
+	}
+
+	/**
+	 *  Insert an event object onto the timeline. Events must have a "time" attribute.
+	 *  @param event  The event object to insert into the timeline.
+	 */
+	add(event: GenericEvent): Timeline<GenericEvent> {
+		// the event needs to have a time attribute
+		this.assert(Reflect.has(event, "time"), "Timeline: events must have a time attribute");
+		event.time = event.time.valueOf();
+		const index = this._search(event.time);
+		this._timeline.splice(index + 1, 0, event);
+		// if the length is more than the memory, remove the previous ones
+		if (this.length > this.memory) {
+			const diff = this.length - this.memory;
+			this._timeline.splice(0, diff);
+		}
+		return this;
+	}
+
+	/**
+	 *  Remove an event from the timeline.
+	 *  @param  {Object}  event  The event object to remove from the list.
+	 *  @returns {Timeline} this
+	 */
+	remove(event: GenericEvent): Timeline<GenericEvent> {
+		const index = this._timeline.indexOf(event);
+		if (index !== -1) {
+			this._timeline.splice(index, 1);
+		}
+		return this;
+	}
+
+	/**
+	 *  Get the nearest event whose time is less than or equal to the given time.
+	 *  @param  time  The time to query.
+	 */
+	get(time: number): GenericEvent | null {
+		const index = this._search(time);
+		if (index !== -1) {
+			return this._timeline[index];
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 *  Return the first event in the timeline without removing it
+	 *  @returns {Object} The first event object
+	 */
+	peek(): GenericEvent | undefined {
+		return this._timeline[0];
+	}
+
+	/**
+	 *  Return the first event in the timeline and remove it
+	 */
+	shift(): GenericEvent | undefined {
+		return this._timeline.shift();
+	}
+
+	/**
+	 *  Get the event which is scheduled after the given time.
+	 *  @param  time  The time to query.
+	 */
+	getAfter(time: number): GenericEvent | null {
+		const index = this._search(time);
+		if (index + 1 < this._timeline.length) {
+			return this._timeline[index + 1];
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 *  Get the event before the event at the given time.
+	 *  @param  time  The time to query.
+	 */
+	getBefore(time: number): GenericEvent | null {
+		const len = this._timeline.length;
+		// if it's after the last item, return the last item
+		if (len > 0 && this._timeline[len - 1].time < time) {
+			return this._timeline[len - 1];
+		}
+		const index = this._search(time);
+		if (index - 1 >= 0) {
+			return this._timeline[index - 1];
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 *  Cancel events at and after the given time
+	 *  @param  time  The time to query.
+	 */
+	cancel(after: number): Timeline<GenericEvent> {
+		if (this._timeline.length > 1) {
+			let index = this._search(after);
+			if (index >= 0) {
+				if (this._timeline[index].time === after) {
+					// get the first item with that time
+					for (let i = index; i >= 0; i--) {
+						if (this._timeline[i].time === after) {
+							index = i;
+						} else {
+							break;
+						}
+					}
+					this._timeline = this._timeline.slice(0, index);
+				} else {
+					this._timeline = this._timeline.slice(0, index + 1);
+				}
+			} else {
+				this._timeline = [];
+			}
+		} else if (this._timeline.length === 1) {
+			// the first item's time
+			if (this._timeline[0].time >= after) {
+				this._timeline = [];
+			}
+		}
+		return this;
+	}
+
+	/**
+	 *  Cancel events before or equal to the given time.
+	 *  @param  {Number}  time  The time to cancel before.
+	 *  @returns {Timeline} this
+	 */
+	cancelBefore(time): Timeline<GenericEvent> {
+		const index = this._search(time);
+		if (index >= 0) {
+			this._timeline = this._timeline.slice(index + 1);
+		}
+		return this;
+	}
+
+	/**
+	 * Returns the previous event if there is one. null otherwise
+	 * @param  {Object} event The event to find the previous one of
+	 * @return {Object}       The event right before the given event
+	 */
+	previousEvent(event): GenericEvent | null {
+		const index = this._timeline.indexOf(event);
+		if (index > 0) {
+			return this._timeline[index - 1];
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 *  Does a binary search on the timeline array and returns the
+	 *  nearest event index whose time is after or equal to the given time.
+	 *  If a time is searched before the first index in the timeline, -1 is returned.
+	 *  If the time is after the end, the index of the last item is returned.
+	 *  @param  time
+	 *  @private
+	 */
+	private _search(time: number): number {
+		if (this._timeline.length === 0) {
+			return -1;
+		}
+		let beginning = 0;
+		const len = this._timeline.length;
+		let end = len;
+		if (len > 0 && this._timeline[len - 1].time <= time) {
+			return len - 1;
+		}
+		while (beginning < end) {
+			// calculate the midpoint for roughly equal partition
+			let midPoint = Math.floor(beginning + (end - beginning) / 2);
+			const event = this._timeline[midPoint];
+			const nextEvent = this._timeline[midPoint + 1];
+			if (event.time === time) {
+				// choose the last one that has the same time
+				for (let i = midPoint; i < this._timeline.length; i++) {
+					const testEvent = this._timeline[i];
+					if (testEvent.time === time) {
+						midPoint = i;
+					}
+				}
+				return midPoint;
+			} else if (event.time < time && nextEvent.time > time) {
+				return midPoint;
+			} else if (event.time > time) {
+				// search lower
+				end = midPoint;
+			} else {
+				// search upper
+				beginning = midPoint + 1;
+			}
+		}
+		return -1;
+	}
+
+	/**
+	 *  Internal iterator. Applies extra safety checks for
+	 *  removing items from the array.
+	 */
+	private _iterate(
+		callback: (event: GenericEvent) => void,
+		lowerBound = 0, upperBound = this._timeline.length - 1,
+	): void {
+		this._timeline.slice(lowerBound, upperBound + 1).forEach(callback);
+	}
+
+	/**
+	 *  Iterate over everything in the array
+	 *  @param  callback The callback to invoke with every item
+	 */
+	forEach(callback: (event: GenericEvent) => void): Timeline<GenericEvent> {
+		this._iterate(callback);
+		return this;
+	}
+
+	/**
+	 *  Iterate over everything in the array at or before the given time.
+	 *  @param  time The time to check if items are before
+	 *  @param  callback The callback to invoke with every item
+	 */
+	forEachBefore(time, callback: (event: GenericEvent) => void): Timeline<GenericEvent> {
+		// iterate over the items in reverse so that removing an item doesn't break things
+		const upperBound = this._search(time);
+		if (upperBound !== -1) {
+			this._iterate(callback, 0, upperBound);
+		}
+		return this;
+	}
+
+	/**
+	 *  Iterate over everything in the array after the given time.
+	 *  @param  time The time to check if items are before
+	 *  @param  callback The callback to invoke with every item
+	 */
+	forEachAfter(time, callback: (event: GenericEvent) => void): Timeline<GenericEvent> {
+		// iterate over the items in reverse so that removing an item doesn't break things
+		const lowerBound = this._search(time);
+		this._iterate(callback, lowerBound + 1);
+		return this;
+	}
+
+	/**
+	 *  Iterate over everything in the array between the startTime and endTime.
+	 *  The timerange is inclusive of the startTime, but exclusive of the endTime.
+	 *  range = [startTime, endTime).
+	 *  @param  startTime The time to check if items are before
+	 *  @param  endTime The end of the test interval.
+	 *  @param  callback The callback to invoke with every item
+	 */
+	forEachBetween(startTime: number, endTime: number, callback: (event: GenericEvent) => void): Timeline<GenericEvent> {
+		let lowerBound = this._search(startTime);
+		let upperBound = this._search(endTime);
+		if (lowerBound !== -1 && upperBound !== -1) {
+			if (this._timeline[lowerBound].time !== startTime) {
+				lowerBound += 1;
+			}
+			// exclusive of the end time
+			if (this._timeline[upperBound].time === endTime) {
+				upperBound -= 1;
+			}
+			this._iterate(callback, lowerBound, upperBound);
+		} else if (lowerBound === -1) {
+			this._iterate(callback, 0, upperBound);
+		}
+		return this;
+	}
+
+	/**
+	 *  Iterate over everything in the array at or after the given time. Similar to
+	 *  forEachAfter, but includes the item(s) at the given time.
+	 *  @param  time The time to check if items are before
+	 *  @param  callback The callback to invoke with every item
+	 */
+	forEachFrom(time: number, callback: (event: GenericEvent) => void): Timeline<GenericEvent> {
+		// iterate over the items in reverse so that removing an item doesn't break things
+		let lowerBound = this._search(time);
+		// work backwards until the event time is less than time
+		while (lowerBound >= 0 && this._timeline[lowerBound].time >= time) {
+			lowerBound--;
+		}
+		this._iterate(callback, lowerBound + 1);
+		return this;
+	}
+
+	/**
+	 *  Iterate over everything in the array at the given time
+	 *  @param  time The time to check if items are before
+	 *  @param  callback The callback to invoke with every item
+	 */
+	forEachAtTime(time: number, callback: (event: GenericEvent) => void): Timeline<GenericEvent> {
+		// iterate over the items in reverse so that removing an item doesn't break things
+		const upperBound = this._search(time);
+		if (upperBound !== -1) {
+			this._iterate(event => {
+				if (event.time === time) {
+					callback(event);
+				}
+			}, 0, upperBound);
+		}
+		return this;
+	}
+
+	/**
+	 *  Clean up.
+	 */
+	dispose(): Timeline<GenericEvent> {
+		this._timeline = [];
+		return this;
+	}
+}

Tone/core/Tone.ts

@@ -0,0 +1,147 @@
+/**
+ *  Tone.js
+ *  @author Yotam Mann
+ *  @license http://opensource.org/licenses/MIT MIT License
+ *  @copyright 2014-2019 Yotam Mann
+ */
+import "../type/Units";
+import { version } from "../version";
+
+///////////////////////////////////////////////////////////////////////////
+// 	TONE
+///////////////////////////////////////////////////////////////////////////
+
+// tslint:disable-next-line: no-empty-interface
+export interface BaseToneOptions {}
+
+/**
+ *  @class  Tone is the base class of all other classes.
+ *  @constructor
+ */
+export abstract class Tone {
+
+	/**
+	 * The version number semver
+	 */
+	static version: string = version;
+
+	/**
+	 * The name of the class
+	 */
+	protected abstract name: string;
+
+	/**
+	 *  disconnect and dispose.
+	 */
+	abstract dispose(): Tone;
+
+	/**
+	 * Takes a partial options an returns the completed options by filling in the defaults
+	 */
+	static getDefaults(): BaseToneOptions {
+		return {};
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	DEBUGGING
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 * Set this debug flag to log all events that happen in this class.
+	 */
+	protected debug: boolean = false;
+
+	/**
+	 * Prints the outputs to the console log for debugging purposes.
+	 * Prints the contents only if either the object has a property
+	 * called `debug` set to true, or a variable called TONE_DEBUG_CLASS
+	 * is set to the name of the class.
+	 * @param args
+	 *  @example
+	 * //prints all logs originating from Tone.OscillatorNode
+	 * Tone.global.TONE_DEBUG_CLASS = "OscillatorNode"
+	 */
+	protected log(...args): void {
+		// if the object is either set to debug = true
+		// or if there is a string on the Tone.global.with the class name
+		// if (this.debug || this.toString() === global.TONE_DEBUG_CLASS) {
+		// 	args.unshift(this.toString() + ":");
+		// 	// eslint-disable-next-line no-console
+		// 	console.log(...args);
+		// }
+	}
+
+	/**
+	 *  Assert that the statement is true, otherwise invoke the error.
+	 *  @param {Boolean} statement
+	 *  @param {String} error The message which is passed into an Error
+	 *  @private
+	 */
+	protected assert(statement: boolean, error: string): void {
+		if (!statement) {
+			throw new Error(error);
+		}
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	DEFAULTS
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 *  If the `given` parameter is undefined, use the `fallback`.
+	 *  If both `given` and `fallback` are object literals, it will
+	 *  return a deep copy which includes all of the parameters from both
+	 *  objects. If a parameter is undefined in given, it will return
+	 *  the fallback property.
+	 *  <br><br>
+	 *  WARNING: if object is self referential, it will go into an an
+	 *  infinite recursive loop.
+	 *  @memberOf Tone
+	 *  @param  {*} given
+	 *  @param  {*} fallback
+	 *  @return {*}
+	 */
+	// static defaultArg(given, fallback) {
+		// if (isObject(given) && isObject(fallback)) {
+		// 	const ret = {};
+		// 	// make a deep copy of the given object
+		// 	for (const givenProp in given) {
+		// 		ret[givenProp] = Tone.defaultArg(fallback[givenProp], given[givenProp]);
+		// 	}
+		// 	for (const fallbackProp in fallback) {
+		// 		ret[fallbackProp] = Tone.defaultArg(given[fallbackProp], fallback[fallbackProp]);
+		// 	}
+		// 	return ret;
+		// } else {
+		// 	return isUndef(given) ? fallback : given;
+		// }
+	// }
+
+	// protected options(argsArray: IArguments, keys: string[]): object {
+	// 	let options: any = {};
+	// 	const args = Array.from(argsArray);
+	// 	if (args[0] instanceof BaseAudioContext) {
+	// 		options.context = args.shift();
+	// 	}
+	// 	if (args.length === 1 && isObject(args[0])) {
+	// 		options = Object.assign(options, args[0]);
+	// 	} else {
+	// 		for (let i = 0; i < keys.length; i++) {
+	// 			if (isDefined(args[i])) {
+	// 				options[keys[i]] = args[i];
+	// 			}
+	// 		}
+	// 	}
+	// 	return deepMerge(this.getDefaults(), options);
+	// }
+
+	/**
+	 * Convert the class to a string
+	 * @example
+	 * const osc = new Oscillator()
+	 * osc.toString() // "Oscillator"
+	 */
+	toString(): string {
+		return this.name;
+	}
+}

Tone/core/Util.ts

@@ -0,0 +1,169 @@
+import { BaseToneOptions } from "./Tone";
+
+// return an interface which excludes certain keys
+export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
+
+/**
+ * Recursively merge an object
+ * @param target the object to merge into
+ * @param sources the source objects to merge
+ */
+export function deepMerge<T>(target: T, ...sources: T[]): T {
+	if (!sources.length) { return target; }
+	const source = sources.shift();
+
+	if (isObject(target) && isObject(source)) {
+		for (const key in source) {
+			if (isObject(source[key])) {
+				if (!target[key]) { Object.assign(target, { [key]: {} }); }
+				deepMerge(target[key], source[key] as any);
+			} else {
+				Object.assign(target, { [key]:  source[key] as any });
+			}
+		}
+	}
+
+	return deepMerge(target, ...sources);
+}
+
+/**
+ * Convert an args array into an object.
+ */
+export function optionsFromArguments<T>(defaults: T, argsArray: IArguments, keys: string[]): T {
+	const opts: any = {};
+	const args = Array.from(argsArray);
+	if (args.length === 1 && isObject(args[0])) {
+		deepMerge(opts, args[0]);
+	} else {
+		for (let i = 0; i < keys.length; i++) {
+			if (isDefined(args[i])) {
+				opts[keys[i]] = args[i];
+			}
+		}
+	}
+	return deepMerge(defaults, opts);
+}
+
+/**
+ * Return this instances default values by calling Constructor.getDefaults()
+ */
+export function getDefaultsFromInstance<T>(instance: T): BaseToneOptions {
+	type ToneClass = {
+		constructor: ToneClass;
+		getDefaults: () => BaseToneOptions;
+	} & T;
+
+	return (instance as ToneClass).constructor.getDefaults();
+}
+
+/**
+ * Take an array of arguments and return a formatted options object.
+ * @param args the arguments passed into the function
+ * @param keys an array of keys
+ * @param defaults the class's defaults
+ */
+// export function defaultArg<T>(given: T, fallback): T {
+
+// }
+
+/**
+ *  Test if the arg is undefined
+ */
+export function isUndef(arg: any): arg is undefined {
+	return typeof arg === "undefined";
+}
+
+/**
+ *  Test if the arg is not undefined
+ */
+export function isDefined<T>(arg: T | undefined): arg is T {
+	return !isUndef(arg);
+}
+
+/**
+ *  Test if the arg is a function
+ */
+export function isFunction(arg: any): arg is (a: any) => any {
+	return typeof arg === "function";
+}
+
+/**
+ *  Test if the argument is a number.
+ */
+export function isNumber(arg: any): arg is number {
+	return (typeof arg === "number");
+}
+
+/**
+ *  Test if the given argument is an object literal (i.e. `{}`);
+ */
+export function isObject(arg: any): arg is object {
+	return (Object.prototype.toString.call(arg) === "[object Object]" && arg.constructor === Object);
+}
+
+/**
+ *  Test if the argument is a boolean.
+ */
+export function isBoolean(arg: any): arg is boolean {
+	return (typeof arg === "boolean");
+}
+
+/**
+ *  Test if the argument is an Array
+ */
+export function isArray(arg: any): arg is any[] {
+	return (Array.isArray(arg));
+}
+
+/**
+ *  Test if the argument is a string.
+ */
+export function isString(arg: any): arg is string {
+	return (typeof arg === "string");
+}
+
+/**
+ *  Test if the argument is in the form of a note in scientific pitch notation.
+ *  e.g. "C4"
+ */
+export function isNote(arg: any): arg is Note {
+	return isString(arg) && /^([a-g]{1}(?:b|#|x|bb)?)(-?[0-9]+)/i.test(arg);
+}
+
+/**
+ *  Make the property not writable using `defineProperty`. Internal use only.
+ */
+export function readOnly(target: object, property: string | string[]): void {
+	if (isArray(property)) {
+		property.forEach(str => readOnly(target, str));
+	} else {
+		Object.defineProperty(target, property, {
+			enumerable : true,
+			writable : false,
+		});
+	}
+}
+
+/**
+ *  Make an attribute writeable. Internal use only.
+ */
+export function writable(target: object, property: string | string[]): void {
+	if (isArray(property)) {
+		property.forEach(str => this._writable(str));
+	} else {
+		Object.defineProperty(target, property, {
+			writable : true,
+		});
+	}
+}
+
+/**
+ * Apply a mixin to extend the derived constructor with the prototype of the baseConstructors
+ */
+export function applyMixins(derivedCtor: any, baseCtors: any[]): void {
+	baseCtors.forEach(baseCtor => {
+		Object.getOwnPropertyNames(baseCtor.prototype).forEach(name => {
+			derivedCtor.prototype[name] = baseCtor.prototype[name];
+		});
+	});
+}

Tone/node/AbstractParam.ts

@@ -0,0 +1,185 @@
+import "../type/Units";
+import { AudioProcessor, AudioProcessorOptions } from "./AudioProcessor";
+
+export abstract class AbstractParam<Type extends Unit> {
+
+	/**
+	 * Schedules a parameter value change at the given time.
+	 * Does this work? is this working. are you working?
+	 * @param value The value to set the signal.
+	 * @param time The time when the change should occur.
+	 * @example
+	 * //set the frequency to "G4" in exactly 1 second from now.
+	 * freq.setValueAtTime("G4", "+1");
+	 */
+	abstract setValueAtTime(value: UnitMap[Type], time: Time): this;
+
+	/**
+	 *  Get the signals value at the given time. Subsequent scheduling
+	 *  may invalidate the returned value.
+	 *  @param time When to get the value
+	 */
+	abstract getValueAtTime(time: Time): UnitMap[Type];
+
+	/**
+	 * Creates a schedule point with the current value at the current time.
+	 * This is useful for creating an automation anchor point in order to
+	 * schedule changes from the current value.
+	 * @param time When to add a ramp point.
+	 * @example
+	 * param.getValueAtTime(Tone.now())
+	 */
+	abstract setRampPoint(time: Time): this;
+
+	/**
+	 * Schedules a linear continuous change in parameter value from the
+	 * previous scheduled parameter value to the given value.
+	 */
+	abstract linearRampToValueAtTime(value: UnitMap[Type], time: Time): this;
+
+	/**
+	 *  Schedules an exponential continuous change in parameter value from
+	 *  the previous scheduled parameter value to the given value.
+	 */
+	abstract exponentialRampToValueAtTime(value: UnitMap[Type], time: Time): this;
+
+	/**
+	 * Schedules an exponential continuous change in parameter value from
+	 * the current time and current value to the given value over the
+	 * duration of the rampTime.
+	 * @param value   The value to ramp to.
+	 * @param rampTime the time that it takes the
+	 *                              value to ramp from it's current value
+	 * @param startTime When the ramp should start.
+	 * @example
+	 * //exponentially ramp to the value 2 over 4 seconds.
+	 * signal.exponentialRampTo(2, 4);
+	 */
+	abstract exponentialRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this;
+
+	/**
+	 *  Schedules an linear continuous change in parameter value from
+	 *  the current time and current value to the given value over the
+	 *  duration of the rampTime.
+	 *
+	 *  @param  value   The value to ramp to.
+	 *  @param  rampTime the time that it takes the
+	 *                               value to ramp from it's current value
+	 *  @param startTime 	When the ramp should start.
+	 *  @returns {Param} this
+	 *  @example
+	 * //linearly ramp to the value 4 over 3 seconds.
+	 * signal.linearRampTo(4, 3);
+	 */
+	abstract linearRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this;
+
+	/**
+	 *  Start exponentially approaching the target value at the given time. Since it
+	 *  is an exponential approach it will continue approaching after the ramp duration. The
+	 *  rampTime is the time that it takes to reach over 99% of the way towards the value.
+	 *  @param  value   The value to ramp to.
+	 *  @param  rampTime the time that it takes the
+	 *                               value to ramp from it's current value
+	 *  @param startTime 	When the ramp should start.
+	 *  @example
+	 * //exponentially ramp to the value 2 over 4 seconds.
+	 * signal.exponentialRampTo(2, 4);
+	 */
+	abstract targetRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this;
+
+	/**
+	 * Start exponentially approaching the target value at the given time. Since it
+	 * is an exponential approach it will continue approaching after the ramp duration. The
+	 * rampTime is the time that it takes to reach over 99% of the way towards the value. This methods
+	 * is similar to setTargetAtTime except the third argument is a time instead of a 'timeConstant'
+	 * @param  value   The value to ramp to.
+	 * @param time 	When the ramp should start.
+	 * @param  rampTime the time that it takes the value to ramp from it's current value
+	 * @example
+	 * //exponentially ramp to the value 2 over 4 seconds.
+	 * signal.exponentialRampTo(2, 4);
+	 */
+	abstract exponentialApproachValueAtTime(value: UnitMap[Type], time: Time, rampTime: Time): this;
+
+	/**
+	 * Start exponentially approaching the target value at the given time with
+	 * a rate having the given time constant.
+	 * @param value
+	 * @param startTime
+	 * @param timeConstant
+	 */
+	abstract setTargetAtTime(value: UnitMap[Type], startTime: Time, timeConstant: number): this;
+
+	/**
+	 * Sets an array of arbitrary parameter values starting at the given time
+	 * for the given duration.
+	 *
+	 * @param values
+	 * @param startTime
+	 * @param duration
+	 * @param scaling If the values in the curve should be scaled by some value
+	 */
+	abstract setValueCurveAtTime(values: Type[], startTime: Time, duration: Time, scaling?: number): this;
+
+	/**
+	 * Cancels all scheduled parameter changes with times greater than or
+	 * equal to startTime.
+	 */
+	abstract cancelScheduledValues(time: Time): this;
+
+	/**
+	 * This is similar to [cancelScheduledValues](#cancelScheduledValues) except
+	 * it holds the automated value at time until the next automated event.
+	 */
+	abstract cancelAndHoldAtTime(time: Time): this;
+
+	/**
+	 * Ramps to the given value over the duration of the rampTime.
+	 * Automatically selects the best ramp type (exponential or linear)
+	 * depending on the `units` of the signal
+	 *
+	 * @param  value
+	 * @param  rampTime The time that it takes the value to ramp from it's current value
+	 * @param startTime When the ramp should start.
+	 * @example
+	 * //ramp to the value either linearly or exponentially
+	 * //depending on the "units" value of the signal
+	 * signal.rampTo(0, 10);
+	 * @example
+	 * //schedule it to ramp starting at a specific time
+	 * signal.rampTo(0, 10, 5)
+	 */
+	abstract rampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this;
+
+	/**
+	 * The current value of the parameter. Setting this value
+	 * is equivalent to setValueAtTime(value, context.currentTime)
+	 */
+	abstract value: UnitMap[Type];
+
+	/**
+	 * If the value should be converted or not
+	 */
+	abstract convert: boolean;
+
+	/**
+	 * The unit type
+	 */
+	abstract readonly units: Unit;
+
+	/**
+	 * True if the signal value is being overridden by
+	 * a connected signal. Internal use only.
+	 */
+	abstract readonly overridden: boolean = false;
+
+	/**
+	 * The minimum value of the output given the units
+	 */
+	abstract readonly minValue: UnitMap[Type];
+
+	/**
+	 * The maximum value of the output given the units
+	 */
+	abstract readonly maxValue: UnitMap[Type];
+}

Tone/node/AudioNode.ts

@@ -0,0 +1,275 @@
+import { connect, connectSeries, disconnect } from "../core/Connect";
+import { isArray, isDefined, optionsFromArguments } from "../core/Util";
+import { AudioProcessor, AudioProcessorOptions } from "./AudioProcessor";
+import { Param } from "./Param";
+
+export type InputNode = ToneAudioNode | AudioNode | AudioParam | Param<Unit>;
+export type OutputNode = ToneAudioNode | AudioNode;
+
+export interface ChannelProperties {
+	channelCount: number;
+	channelCountMode: ChannelCountMode;
+	channelInterpretation: ChannelInterpretation;
+}
+
+/**
+ * The possible options for this node
+ */
+export interface ToneAudioNodeOptions extends AudioProcessorOptions {
+	numberOfInputs: number;
+	numberOfOutputs: number;
+	channelCount: number;
+	channelCountMode: ChannelCountMode;
+	channelInterpretation: ChannelInterpretation;
+}
+
+/**
+ *  ToneAudioNode is the base class for classes which process audio.
+ */
+export abstract class ToneAudioNode<Options extends ToneAudioNodeOptions = ToneAudioNodeOptions>
+extends AudioProcessor<Options> {
+
+	abstract name = "ToneAudioNode";
+
+	/**
+	 * The input node or nodes. If the object is a source,
+	 * it does not have any input and this.input is undefined.
+	 */
+	abstract input: InputNode | InputNode[] | undefined;
+
+	/**
+	 * The output nodes. If the object is a sink,
+	 * it does not have any output and this.output is undefined.
+	 */
+	abstract output: OutputNode | OutputNode[] | undefined;
+
+	/**
+	 *  The number of inputs feeding into the AudioNode.
+	 *  For source nodes, this will be 0.
+	 */
+	readonly numberOfInputs: number;
+
+	/**
+	 *  The number of outputs of the AudioNode.
+	 */
+	readonly numberOfOutputs: number;
+
+	/**
+	 * List all of the node that must be set to match the ChannelProperties
+	 */
+	protected abstract _internalChannels: OutputNode[];
+
+	static getDefaults(): ToneAudioNodeOptions {
+		return Object.assign(AudioProcessor.getDefaults(), {
+			channelCount: 2,
+			channelCountMode: "max" as ChannelCountMode,
+			channelInterpretation: "speakers" as ChannelInterpretation,
+			numberOfInputs: 0,
+			numberOfOutputs: 0,
+		});
+	}
+
+	constructor(options: Partial<ToneAudioNodeOptions>);
+	constructor() {
+		super(optionsFromArguments(ToneAudioNode.getDefaults(), arguments, ["context"]));
+
+		const options = optionsFromArguments(ToneAudioNode.getDefaults(), arguments, ["context"]);
+
+		this.numberOfInputs = options.numberOfInputs;
+		this.numberOfOutputs = options.numberOfInputs;
+	}
+
+	protected createInsOuts(numberOfInputs: number = 0, numberOfOutputs: number = 0): void {
+		if (numberOfInputs === 1) {
+			this.input = this.context.createGain();
+		} else if (numberOfInputs > 1) {
+			this.input = [];
+			for (let i = 0; i < numberOfInputs; i++) {
+				this.input[i] = this.context.createGain();
+			}
+		}
+
+		if (numberOfOutputs === 1) {
+			this.output = this.context.createGain();
+		} else if (numberOfOutputs > 1) {
+			this.output = [];
+			for (let o = 0; o < numberOfOutputs; o++) {
+				this.output[o] = this.context.createGain();
+			}
+		}
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// AUDIO PROPERTIES
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 * Set the audio options for this node such as channelInterpretation
+	 * channelCount, etc.
+	 * @param options
+	 */
+	private _setChannelProperties(options: ChannelProperties): void {
+		if (this._internalChannels.length) {
+			this._internalChannels.forEach(node => {
+				node.channelCount = options.channelCount;
+				node.channelCountMode = options.channelCountMode;
+				node.channelInterpretation = options.channelInterpretation;
+			});
+		}
+	}
+
+	/**
+	 * Get the current audio options for this node such as channelInterpretation
+	 * channelCount, etc.
+	 */
+	private _getChannelProperties(): ChannelProperties {
+		if (this._internalChannels.length) {
+			const node = this._internalChannels[0];
+			return {
+				channelCount: node.channelCount,
+				channelCountMode: node.channelCountMode,
+				channelInterpretation: node.channelInterpretation,
+			};
+		} else {
+			// return the defaults
+			return {
+				channelCount: 2,
+				channelCountMode: "max",
+				channelInterpretation: "speakers",
+			};
+		}
+	}
+
+	/**
+	 *  channelCount is the number of channels used when up-mixing and down-mixing
+	 *  connections to any inputs to the node. The default value is 2 except for
+	 *  specific nodes where its value is specially determined.
+	 */
+	get channelCount(): number {
+		return this._getChannelProperties().channelCount;
+	}
+	set channelCount(channelCount: number) {
+		const props = this._getChannelProperties();
+		// merge it with the other properties
+		this._setChannelProperties(Object.assign(props, { channelCount }));
+	}
+
+	/**
+	 *  channelCountMode determines how channels will be counted when up-mixing and
+	 *  down-mixing connections to any inputs to the node.
+	 *  The default value is "max". This attribute has no effect for nodes with no inputs.
+	 */
+	get channelCountMode(): ChannelCountMode {
+		return this._getChannelProperties().channelCountMode;
+	}
+	set channelCountMode(channelCountMode: ChannelCountMode) {
+		const props = this._getChannelProperties();
+		// merge it with the other properties
+		this._setChannelProperties(Object.assign(props, { channelCountMode }));
+	}
+
+	/**
+	 *  channelInterpretation determines how individual channels will be treated
+	 *  when up-mixing and down-mixing connections to any inputs to the node.
+	 *  The default value is "speakers".
+	 */
+	get channelInterpretation(): ChannelInterpretation {
+		return this._getChannelProperties().channelInterpretation;
+	}
+	set channelInterpretation(channelInterpretation: ChannelInterpretation) {
+		const props = this._getChannelProperties();
+		// merge it with the other properties
+		this._setChannelProperties(Object.assign(props, { channelInterpretation }));
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// CONNECTIONS
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 * connect the output of a ToneAudioNode to an AudioParam, AudioNode, or ToneAudioNode
+	 * @param unit The output to connect to
+	 * @param outputNum The output to connect from
+	 * @param inputNum The input to connect to
+	 */
+	connect(destination: InputNode, outputNum = 0, inputNum = 0): this {
+		connect(this, destination, outputNum, inputNum);
+		return this;
+	}
+
+	/**
+	 * Connect the output to the context's destination node.
+	 * alias for {@link toDestination}
+	 */
+	toMaster(): this {
+		this.connect(this.context.destination);
+		return this;
+	}
+
+	/**
+	 *  disconnect the output
+	 *  @param output Either the output index to disconnect if the output is an array, or the node to disconnect from.
+	 */
+	disconnect(destination?: InputNode, outputNum = 0, inputNum = 0): this {
+		disconnect(this, destination, outputNum, inputNum);
+		return this;
+	}
+
+	/**
+	 *  Connect the output of this node to the rest of the nodes in series.
+	 *  @param nodes
+	 *  @example
+	 *  //connect a node to an effect, panVol and then to the master output
+	 *  node.chain(effect, panVol, Tone.Destination);
+	 */
+	chain(...nodes: InputNode[]): this {
+		connectSeries(...nodes);
+		return this;
+	}
+
+	/**
+	 *  connect the output of this node to the rest of the nodes in parallel.
+	 *  @param nodes
+	 *  @returns this
+	 */
+	fan(...nodes: InputNode[]): this {
+		nodes.forEach(node => this.connect(node));
+		return this;
+	}
+
+	/**
+	 * Dispose and disconnect
+	 */
+	dispose(): this {
+		if (isDefined(this.input)) {
+			if (isArray(this.input)) {
+				this.input.forEach(input => {
+					if (input instanceof ToneAudioNode) {
+						input.dispose();
+					} else if (input instanceof AudioNode) {
+						input.disconnect();
+					}
+				});
+			} else {
+				if (this.input instanceof AudioNode) {
+					this.input.disconnect();
+				}
+			}
+		}
+		if (isDefined(this.output)) {
+			if (isArray(this.output)) {
+				this.output.forEach(output => {
+					if (output instanceof ToneAudioNode) {
+						output.dispose();
+					} else {
+						output.disconnect();
+					}
+				});
+			} else {
+				this.output.disconnect();
+			}
+		}
+		this._internalChannels = [];
+		return this;
+	}
+}

Tone/node/AudioProcessor.ts

@@ -0,0 +1,156 @@
+import { getContext } from "../core/Global";
+import { Tone } from "../core/Tone";
+import { getDefaultsFromInstance, isDefined, isUndef, optionsFromArguments } from "../core/Util";
+import "../type/Units";
+
+/**
+ * A unit which process audio
+ */
+export interface AudioProcessorOptions {
+	context: BaseAudioContext;
+}
+
+/**
+ * The BaseAudioContext belonging to this node
+ */
+export abstract class AudioProcessor<Options extends AudioProcessorOptions> extends Tone {
+
+	/**
+	 * The context belonging to the node.
+	 */
+	readonly context: BaseAudioContext;
+
+	readonly defaultContext?: BaseAudioContext;
+
+	constructor(context?: BaseAudioContext | Partial<AudioProcessorOptions>) {
+		const options = optionsFromArguments(AudioProcessor.getDefaults(), arguments, ["context"]);
+		super();
+		if (this.defaultContext) {
+			this.context = this.defaultContext;
+		} else {
+			this.context = options.context;
+		}
+	}
+
+	static getDefaults(): AudioProcessorOptions {
+		return {
+			context: getContext(),
+		};
+	}
+
+	/**
+	 * Return the current time of the BaseAudioContext clock plus the lookAhead.
+	 */
+	now(): Seconds {
+		return this.context.currentTime;
+	}
+
+	/**
+	 * Return the current time of the BaseAudioContext clock without any lookAhead.
+	 */
+	immediate(): Seconds {
+		return this.context.currentTime;
+	}
+
+	/**
+	 * The duration in seconds of one sample.
+	 */
+	get sampleTime(): Seconds {
+		return 1 / this.context.sampleRate;
+	}
+
+	/**
+	 * The number of seconds of 1 processing block (128 samples)
+	 */
+	get blockTime(): Seconds {
+		return 128 / this.context.sampleRate;
+	}
+
+	/**
+	 * Convert the incoming time to seconds
+	 */
+	toSeconds(time: Time): Seconds {
+		if (isUndef(time)) {
+			return this.now();
+		} else {
+			return time as Seconds;
+		}
+	}
+
+	/**
+	 * Convert the input to a frequency number
+	 */
+	toFrequency(frequency: Frequency): Hertz {
+		return frequency as Hertz;
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	GET/SET
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 * Get the object's attributes. Given no arguments get
+	 * will return all available object properties and their corresponding
+	 * values. Pass in a single attribute to retrieve or an array
+	 * of attributes. The attribute strings can also include a "."
+	 * to access deeper properties.
+	 * @param params the parameters to get, otherwise will return all available.
+	 * @example
+	 * osc.get();
+	 * //returns {"type" : "sine", "frequency" : 440, ...etc}
+	 * @example
+	 * osc.get("type");
+	 * //returns { "type" : "sine"}
+	 * @example
+	 * //use dot notation to access deep properties
+	 * synth.get(["envelope.attack", "envelope.release"]);
+	 * //returns {"envelope" : {"attack" : 0.2, "release" : 0.4}}
+	 */
+	get(): Options {
+		const defaults = getDefaultsFromInstance(this) as Options;
+		Object.keys(defaults).forEach(attribute => {
+			if (Reflect.has(this, attribute)) {
+				const member = this[attribute];
+				if (isDefined(member) && isDefined(member.value)) {
+					defaults[attribute] = member.value;
+				} else if (member instanceof AudioProcessor) {
+					defaults[attribute] = member.get();
+				} else {
+					defaults[attribute] = member;
+				}
+			}
+
+		});
+		return defaults;
+	}
+
+	/**
+	 * Set the parameters at once. Either pass in an
+	 * object mapping parameters to values, or to set a
+	 * single parameter, by passing in a string and value.
+	 * The last argument is an optional ramp time which
+	 * will ramp any signal values to their destination value
+	 * over the duration of the rampTime.
+	 * @param  params
+	 * @example
+	 * //set values using an object
+	 * filter.set({
+	 * 	"frequency" : 300,
+	 * 	"type" : "highpass"
+	 * });
+	 */
+	set(props: Partial<Options>): AudioProcessor<Options> {
+		Object.keys(props).forEach(attribute => {
+			if (Reflect.has(this, attribute)) {
+				if (isDefined(this[attribute]) && isDefined(this[attribute].value)) {
+					this[attribute].value = props[attribute];
+				} else if (this[attribute] instanceof AudioProcessor) {
+					this[attribute].set(props[attribute]);
+				} else {
+					this[attribute] = props[attribute];
+				}
+			}
+		});
+		return this;
+	}
+}

Tone/node/Delay.ts

@@ -0,0 +1,82 @@
+import { optionsFromArguments, readOnly } from "../core/Util";
+import { ToneAudioNode, ToneAudioNodeOptions } from "./AudioNode";
+import { Param } from "./Param";
+
+export interface DelayOptions extends ToneAudioNodeOptions {
+	delayTime: number;
+	maxDelay: number;
+}
+
+/**
+ *  Wrapper around Web Audio's native [DelayNode](http://webaudio.github.io/web-audio-api/#the-delaynode-interface).
+ *  @param delayTime The delay applied to the incoming signal.
+ *  @param maxDelay The maximum delay time.
+ */
+export class Delay extends ToneAudioNode<DelayOptions> {
+
+	readonly name = "Delay";
+
+	/**
+	 * The maximum delay time. This cannot be changed after
+	 * the value is passed into the constructor.
+	 */
+	readonly maxDelay: Time;
+
+	/**
+	 *  The amount of time the incoming signal is delayed.
+	 */
+	readonly delayTime: Param<"time">;
+
+	/**
+	 * Private reference to the internal DelayNode
+	 */
+	private _delayNode: DelayNode;
+	readonly input: DelayNode;
+	readonly output: DelayNode;
+
+	/**
+	 * The internal channels for channel routing changes
+	 */
+	protected _internalChannels: AudioNode[];
+
+	constructor(options?: Partial<DelayOptions>)
+	constructor(delayTime?: Time, maxDelay?: Time)
+	constructor() {
+		super(optionsFromArguments(Delay.getDefaults(), arguments, ["delayTime", "maxDelay"]));
+
+		const options = optionsFromArguments(Delay.getDefaults(), arguments, ["delayTime", "maxDelay"]);
+
+		this.maxDelay = Math.max(this.toSeconds(options.maxDelay), this.toSeconds(options.delayTime));
+
+		this._delayNode = this.input = this.output = this.context.createDelay(options.maxDelay);
+		this._internalChannels = [this._delayNode];
+
+		this.delayTime = new Param({
+			context: this.context,
+			param : this._delayNode.delayTime,
+			units : "time",
+			value : options.delayTime,
+		});
+
+		readOnly(this, "delayTime");
+	}
+
+	static getDefaults(): DelayOptions {
+		return Object.assign(ToneAudioNode.getDefaults(), {
+			delayTime : 0,
+			maxDelay: 1,
+			numberOfInputs: 1,
+			numberOfOutputs: 1,
+		});
+	}
+
+	/**
+	 *  Clean up.
+	 */
+	dispose(): this {
+		super.dispose();
+		this._delayNode.disconnect();
+		this.delayTime.dispose();
+		return this;
+	}
+}

Tone/node/Gain.ts

@@ -0,0 +1,77 @@
+import { optionsFromArguments, readOnly } from "../core/Util";
+import "../type/Units";
+import { ToneAudioNode, ToneAudioNodeOptions } from "./AudioNode";
+import { Param } from "./Param";
+
+interface GainOptions extends ToneAudioNodeOptions {
+	gain: number;
+	units: Unit;
+	convert: boolean;
+}
+
+/**
+ * A thin wrapper around the Native Web Audio GainNode.
+ * The GainNode is a basic building block of the Web Audio
+ * API and is useful for routing audio and adjusting gains.
+ * @param  gain The initial gain of the GainNode
+ * @param units The units of the gain parameter.
+ */
+export class Gain<Type extends Unit = "gain"> extends ToneAudioNode<GainOptions> {
+
+	readonly name = "Gain";
+
+	/**
+	 *  The gain parameter of the gain node.
+	 */
+	readonly gain: Param<Type>;
+
+	/**
+	 * The wrapped GainNode.
+	 */
+	private _gainNode: GainNode = this.context.createGain();
+
+	// input = output
+	readonly input: GainNode = this._gainNode;
+	readonly output: GainNode = this._gainNode;
+
+	/**
+	 * Add all of the gain nodes
+	 */
+	protected _internalChannels: AudioNode[] = [this._gainNode];
+
+	constructor(gain?: GainFactor, units?: Unit);
+	constructor(options?: Partial<GainOptions>);
+	constructor() {
+		super(optionsFromArguments(Gain.getDefaults(), arguments, ["gain", "units"]));
+		const options = optionsFromArguments(Gain.getDefaults(), arguments, ["gain", "units"]);
+
+		this.gain = new Param({
+			context : this.context,
+			convert : options.convert,
+			param : this._gainNode.gain,
+			units : options.units,
+			value : options.gain,
+		});
+		readOnly(this, "gain");
+	}
+
+	static getDefaults(): GainOptions {
+		return Object.assign(ToneAudioNode.getDefaults(), {
+			convert : true,
+			gain : 1,
+			numberOfInputs: 1,
+			numberOfOutputs: 1,
+			units : "gain" as Unit,
+		});
+	}
+
+	/**
+	 *  Clean up.
+	 */
+	dispose(): this {
+		super.dispose();
+		this._gainNode.disconnect();
+		this.gain.dispose();
+		return this;
+	}
+}

Tone/node/Param.ts

@@ -0,0 +1,414 @@
+import { Timeline } from "../core/Timeline";
+import { deepMerge, isDefined, optionsFromArguments } from "../core/Util";
+import { dbToGain, gainToDb } from "../type/Conversions";
+import "../type/Units";
+import { AbstractParam } from "./AbstractParam";
+import { AudioProcessor, AudioProcessorOptions } from "./AudioProcessor";
+
+export interface ParamOptions extends AudioProcessorOptions {
+	units: Unit;
+	value?: number;
+	param: AudioParam;
+	convert: boolean;
+}
+
+/**
+ * the possible automation types
+ */
+type AutomationType = "linear" | "exponential" | "setValue" | "setTarget" | "cancel";
+
+/**
+ * The events on the automation
+ */
+export interface AutomationEvent {
+	type: AutomationType;
+	time: number;
+	value: number;
+	constant?: number;
+}
+
+/**
+ *  Param wraps the native Web Audio's AudioParam to provide
+ * additional unit conversion functionality. It also
+ * serves as a base-class for classes which have a single,
+ * automatable parameter.
+ */
+export class Param<Type extends Unit = "number">
+extends AudioProcessor<ParamOptions>
+implements AbstractParam<Type> {
+
+	name = "Param";
+
+	static getDefaults(): ParamOptions {
+		return Object.assign(AudioProcessor.getDefaults(), {
+			convert: true,
+			units: "number" as Unit,
+		} as ParamOptions);
+	}
+
+	/**
+	 * The input connection
+	 */
+	readonly input: AudioParam;
+	readonly units: Unit;
+	convert: boolean;
+	overridden: boolean = false;
+
+	/**
+	 * The timeline which tracks all of the automations.
+	 */
+	private _events: Timeline<AutomationEvent>;
+
+	/**
+	 *  The native parameter to control
+	 */
+	protected _param: AudioParam;
+
+	/**
+	 *  The default value before anything is assigned
+	 */
+	private _initialValue: number;
+
+	/**
+	 *  The minimum output value
+	 */
+	private _minOutput = 1e-5;
+
+	constructor(param: AudioParam, units?: Unit, convert?: boolean);
+	constructor(options: Partial<ParamOptions>);
+	constructor() {
+		super(optionsFromArguments(Param.getDefaults(), arguments, ["param", "units", "convert"]));
+
+		const options = optionsFromArguments(Param.getDefaults(), arguments, ["param", "units", "convert"]);
+
+		this.assert(isDefined(options.param) && options.param instanceof AudioParam, "param must be an AudioParam");
+
+		// initialize
+		this._param = this.input = options.param;
+		this._events = new Timeline<AutomationEvent>(1000);
+		this._initialValue = this._param.value;
+		this.units = options.units;
+		this.convert = options.convert;
+
+		// if the value is defined, set it immediately
+		if (isDefined(options.value)) {
+			this.setValueAtTime(options.value, 0);
+		}
+	}
+
+	get value(): UnitMap[Type] {
+		const now = this.now();
+		return this.getValueAtTime(now);
+	}
+	set value(value: UnitMap[Type]) {
+		this._initialValue = this._fromType(value);
+		this.cancelScheduledValues(this.now());
+		this.setValueAtTime(value, this.now());
+	}
+
+	get minValue(): number {
+		if (this.units === "time" || this.units === "frequency" ||
+			this.units === "normalRange" || this.units === "positive" ||
+			this.units === "transportTime" || this.units === "ticks" ||
+			this.units === "bpm" || this.units === "hertz" || this.units === "samples") {
+			return 0;
+		} else if (this.units === "audioRange") {
+			return -1;
+		} else if (this.units === "decibels") {
+			return -Infinity;
+		} else {
+			return this._param.minValue;
+		}
+	}
+
+	get maxValue(): number {
+		if (this.units === "normalRange" ||
+			this.units === "audioRange") {
+			return 1;
+		} else {
+			return this._param.maxValue;
+		}
+	}
+
+	/**
+	 * Type guard based on the unit name
+	 */
+	private _is<T>(arg, type: Unit): arg is T {
+		return this.units === type;
+	}
+
+	/**
+	 *  Convert the given value from the type specified by Param.units
+	 *  into the destination value (such as Gain or Frequency).
+	 */
+	private _fromType(val: UnitMap[Type]): number {
+		if (this.convert && !this.overridden) {
+			if (this._is<Time>(val, "time")) {
+				return this.toSeconds(val);
+			} else if (this._is<Decibels>(val, "decibels")) {
+				return dbToGain(val);
+			} else if (this._is<Frequency>(val, "frequency")) {
+				return this.toFrequency(val);
+			} else if (this._is<NormalRange>(val, "normalRange")) {
+				return Math.min(Math.max(val, 0), 1);
+			} else if (this._is<AudioRange>(val, "audioRange")) {
+				return Math.min(Math.max(val, -1), 1);
+			} else if (this._is<Positive>(val, "positive")) {
+				return Math.max(val, 0);
+			} else if (this._is<number>(val, "number")) {
+				return val;
+			} else {
+				return val as number;
+			}
+		} else {
+			return val as number;
+		}
+	}
+
+	/**
+	 * Convert the parameters value into the units specified by Param.units.
+	 */
+	private _toType(val: number): UnitMap[Type] {
+		if (this.convert && this.units === "decibels") {
+			return gainToDb(val) as UnitMap[Type];
+		} else {
+			return val as UnitMap[Type];
+		}
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// ABSTRACT PARAM INTERFACE
+	// all docs are generated from ParamInterface.ts
+	///////////////////////////////////////////////////////////////////////////
+
+	setValueAtTime(value: UnitMap[Type], time: Time): this {
+		time = this.toSeconds(time);
+		const numericValue = this._fromType(value);
+		this._events.add({
+			time,
+			type: "setValue",
+			value: numericValue,
+		});
+		this.log("setValue", value, time);
+		this._param.setValueAtTime(numericValue, time);
+		return this;
+	}
+
+	getValueAtTime(time: Time): UnitMap[Type] {
+		time = this.toSeconds(time);
+		const after = this._events.getAfter(time);
+		const before = this._events.get(time);
+		let value = this._initialValue;
+		// if it was set by
+		if (before === null) {
+			value = this._initialValue;
+		} else if (before.type === "setTarget" && (after === null || after.type === "setValue")) {
+			const previous = this._events.getBefore(before.time);
+			let previousVal;
+			if (previous === null) {
+				previousVal = this._initialValue;
+			} else {
+				previousVal = previous.value;
+			}
+			if (isDefined(before.constant)) {
+				value = this._exponentialApproach(before.time, previousVal, before.value, before.constant, time);
+			}
+		} else if (after === null) {
+			value = before.value;
+		} else if (after.type === "linear" || after.type === "exponential") {
+			let beforeValue = before.value;
+			if (before.type === "setTarget") {
+				const previous = this._events.getBefore(before.time);
+				if (previous === null) {
+					beforeValue = this._initialValue;
+				} else {
+					beforeValue = previous.value;
+				}
+			}
+			if (after.type === "linear") {
+				value = this._linearInterpolate(before.time, beforeValue, after.time, after.value, time);
+			} else {
+				value = this._exponentialInterpolate(before.time, beforeValue, after.time, after.value, time);
+			}
+		} else {
+			value = before.value;
+		}
+		return this._toType(value);
+	}
+
+	setRampPoint(time: Time): this {
+		time = this.toSeconds(time);
+		let currentVal = this.getValueAtTime(time);
+		this.cancelAndHoldAtTime(time);
+		if (this._fromType(currentVal) === 0) {
+			currentVal = this._toType(this._minOutput);
+		}
+		this.setValueAtTime(currentVal, time);
+		return this;
+	}
+
+	linearRampToValueAtTime(value: UnitMap[Type], endTime: Time): this {
+		const numericValue = this._fromType(value);
+		endTime = this.toSeconds(endTime);
+		this._events.add({
+			time: endTime,
+			type: "linear",
+			value : numericValue,
+		});
+		this.log("linear", value, endTime);
+		this._param.linearRampToValueAtTime(numericValue, endTime);
+		return this;
+	}
+
+	exponentialRampToValueAtTime(value: UnitMap[Type], endTime: Time): this {
+		let numericValue = this._fromType(value);
+		numericValue = Math.max(this._minOutput, numericValue);
+		endTime = this.toSeconds(endTime);
+		// store the event
+		this._events.add({
+			time: endTime,
+			type: "exponential",
+			value : numericValue,
+		});
+		this.log("exponential", value, endTime);
+		this._param.exponentialRampToValueAtTime(numericValue, endTime);
+		return this;
+	}
+
+	exponentialRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this {
+		startTime = this.toSeconds(startTime);
+		this.setRampPoint(startTime);
+		this.exponentialRampToValueAtTime(value, startTime + this.toSeconds(rampTime));
+		return this;
+	}
+
+	linearRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this {
+		startTime = this.toSeconds(startTime);
+		this.setRampPoint(startTime);
+		this.linearRampToValueAtTime(value, startTime + this.toSeconds(rampTime));
+		return this;
+	}
+
+	targetRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this {
+		startTime = this.toSeconds(startTime);
+		this.setRampPoint(startTime);
+		this.exponentialApproachValueAtTime(value, startTime, rampTime);
+		return this;
+	}
+
+	exponentialApproachValueAtTime(value: UnitMap[Type], time: Time, rampTime: Time): this {
+		const timeConstant = Math.log(this.toSeconds(rampTime) + 1) / Math.log(200);
+		time = this.toSeconds(time);
+		return this.setTargetAtTime(value, time, timeConstant);
+	}
+
+	setTargetAtTime(value: UnitMap[Type], startTime: Time, timeConstant: Positive): this {
+		const numericValue = this._fromType(value);
+		// The value will never be able to approach without timeConstant > 0.
+		this.assert(timeConstant > 0, "timeConstant must be greater than 0");
+		startTime = this.toSeconds(startTime);
+		this._events.add({
+			constant: timeConstant,
+			time: startTime,
+			type: "setTarget",
+			value: numericValue,
+		});
+		this.log("setTarget", value, startTime, timeConstant);
+		this._param.setTargetAtTime(numericValue, startTime, timeConstant);
+		return this;
+	}
+
+	setValueCurveAtTime(values: Array<UnitMap[Type]>, startTime: Time, duration: Time, scaling: number = 1): this {
+		duration = this.toSeconds(duration);
+		startTime = this.toSeconds(startTime);
+		const startingValue = this._fromType(values[0]) * scaling;
+		this.setValueAtTime(this._toType(startingValue), startTime);
+		const segTime = duration / (values.length - 1);
+		for (let i = 1; i < values.length; i++) {
+			const numericValue = this._fromType(values[i]) * scaling;
+			this.linearRampToValueAtTime(this._toType(numericValue), startTime + i * segTime);
+		}
+		return this;
+	}
+
+	cancelScheduledValues(time: Time): this {
+		time = this.toSeconds(time);
+		this._events.cancel(time);
+		this._param.cancelScheduledValues(time);
+		this.log("cancel", time);
+		return this;
+	}
+
+	cancelAndHoldAtTime(time: Time): this {
+		time = this.toSeconds(time);
+		const valueAtTime = this._fromType(this.getValueAtTime(time));
+		this.log("cancelAndHoldAtTime", time, "value=" + valueAtTime);
+
+		// remove the schedule events
+		this._param.cancelScheduledValues(time);
+
+		// if there is an event at the given time
+		// and that even is not a "set"
+		const before = this._events.get(time);
+		const after = this._events.getAfter(time);
+		if (before && before.time === time) {
+			// remove everything after
+			if (after) {
+				this._events.cancel(after.time);
+			} else {
+				this._events.cancel(time + this.sampleTime);
+			}
+		} else if (after) {
+			// cancel the next event(s)
+			this._events.cancel(after.time);
+			if (after.type === "linear") {
+				this.linearRampToValueAtTime(this._toType(valueAtTime), time);
+			} else if (after.type === "exponential") {
+				this.exponentialRampToValueAtTime(this._toType(valueAtTime), time);
+			}
+		}
+
+		// set the value at the given time
+		this._events.add({
+			time,
+			type: "setValue",
+			value: valueAtTime,
+		});
+		this._param.setValueAtTime(valueAtTime, time);
+		return this;
+	}
+
+	rampTo(value: UnitMap[Type], rampTime: Time = 0.1, startTime?: Time): this {
+		if (this.units === "frequency" || this.units === "bpm" || this.units === "decibels") {
+			this.exponentialRampTo(value, rampTime, startTime);
+		} else {
+			this.linearRampTo(value, rampTime, startTime);
+		}
+		return this;
+	}
+
+	dispose(): this {
+		this._events.dispose();
+		return this;
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	AUTOMATION CURVE CALCULATIONS
+	// 	MIT License, copyright (c) 2014 Jordan Santell
+	///////////////////////////////////////////////////////////////////////////
+
+	// Calculates the the value along the curve produced by setTargetAtTime
+	private _exponentialApproach(t0: number, v0: number, v1: number, timeConstant: number, t: number): number {
+		return v1 + (v0 - v1) * Math.exp(-(t - t0) / timeConstant);
+	}
+
+	// Calculates the the value along the curve produced by linearRampToValueAtTime
+	private _linearInterpolate(t0: number, v0: number, t1: number, v1: number, t: number): number {
+		return v0 + (v1 - v0) * ((t - t0) / (t1 - t0));
+	}
+
+	// Calculates the the value along the curve produced by exponentialRampToValueAtTime
+	private _exponentialInterpolate(t0: number, v0: number, t1: number, v1: number, t: number): number {
+		return v0 * Math.pow(v1 / v0, (t - t0) / (t1 - t0));
+	}
+}

Tone/signal/Signal.ts

@@ -0,0 +1,178 @@
+import { optionsFromArguments } from "../core/Util";
+import { AbstractParam } from "../node/AbstractParam";
+import { InputNode, ToneAudioNode, ToneAudioNodeOptions } from "../node/AudioNode";
+import { Param } from "../node/Param";
+
+interface SignalOptions extends ToneAudioNodeOptions {
+	value: number;
+	units: Unit;
+	convert: boolean;
+}
+
+/**
+ * A signal is an audio-rate value. Tone.Signal is a core component of the library.
+ * Unlike a number, Signals can be scheduled with sample-level accuracy. Tone.Signal
+ * has all of the methods available to native Web Audio
+ * [AudioParam](http://webaudio.github.io/web-audio-api/#the-audioparam-interface)
+ * as well as additional conveniences. Read more about working with signals
+ * [here](https://github.com/Tonejs/Tone.js/wiki/Signals).
+ *  @param value Initial value of the signal
+ *  @param units unit The units the signal is in.
+ * @example
+ * const signal = new Tone.Signal(10);
+ */
+export class Signal<Type extends Unit = "number">
+extends ToneAudioNode<SignalOptions>
+implements AbstractParam<Type> {
+
+	name = "Signal";
+
+	static getDefaults(): SignalOptions {
+		return Object.assign(ToneAudioNode.getDefaults(), {
+			channelCount: 1,
+			channelCountMode: "explicit",
+			channelInterpretation: "discrete",
+			convert: true,
+			numberOfInputs: 1,
+			numberOfOutputs: 1,
+			units: "number" as Unit,
+			value: 0,
+		});
+	}
+
+	/**
+	 * The constant source node which generates the signal
+	 */
+	private _constantSource: ConstantSourceNode = this.context.createConstantSource();
+	readonly output: AudioNode = this._constantSource;
+	private _param: Param<Type>;
+	readonly input: Param<Type>;
+	protected _internalChannels = [this._constantSource];
+
+	constructor(value?: UnitMap[Type], units?: Unit);
+	constructor(options?: Partial<SignalOptions>);
+	constructor() {
+
+		super(optionsFromArguments(Signal.getDefaults(), arguments, ["value", "units"]));
+
+		const options = optionsFromArguments(Signal.getDefaults(), arguments, ["value", "units"]);
+
+		this._constantSource.start(0);
+		this.input = this._param = new Param({
+			context: this.context,
+			convert: options.convert,
+			param: this._constantSource.offset,
+			units: options.units,
+			value: options.value,
+		});
+	}
+
+	connect(destination: InputNode, outputNum = 0, inputNum = 0): this {
+		if (destination instanceof Param || destination instanceof AudioParam || destination instanceof Signal) {
+			// cancel changes
+			destination.cancelScheduledValues(0);
+			// reset the value
+			destination.setValueAtTime(0, 0);
+			// mark the value as overridden
+			if (destination instanceof Signal) {
+				destination.overridden = true;
+			}
+		}
+		super.connect(destination, outputNum, inputNum);
+		return this;
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// ABSTRACT PARAM INTERFACE
+	// just a proxy for the ConstantSourceNode's offset AudioParam
+	// all docs are generated from ParamInterface.ts
+	///////////////////////////////////////////////////////////////////////////
+
+	setValueAtTime(value: UnitMap[Type], time: Time): this {
+		this._param.setValueAtTime(value, time);
+		return this;
+	}
+	getValueAtTime(time: Time): UnitMap[Type] {
+		return this._param.getValueAtTime(time);
+	}
+	setRampPoint(time: Time): this {
+		this._param.setRampPoint(time);
+		return this;
+	}
+	linearRampToValueAtTime(value: UnitMap[Type], time: Time): this {
+		this._param.linearRampToValueAtTime(value, time);
+		return this;
+	}
+	exponentialRampToValueAtTime(value: UnitMap[Type], time: Time): this {
+		this._param.exponentialRampToValueAtTime(value, time);
+		return this;
+	}
+	exponentialRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this {
+		this._param.exponentialRampTo(value, rampTime, startTime);
+		return this;
+	}
+	linearRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this {
+		this._param.linearRampTo(value, rampTime, startTime);
+		return this;
+	}
+	targetRampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this {
+		this._param.targetRampTo(value, rampTime, startTime);
+		return this;
+	}
+	exponentialApproachValueAtTime(value: UnitMap[Type], time: Time, rampTime: Time): this {
+		this._param.exponentialApproachValueAtTime(value, time, rampTime);
+		return this;
+	}
+	setTargetAtTime(value: UnitMap[Type], startTime: Time, timeConstant: number): this {
+		this._param.setTargetAtTime(value, startTime, timeConstant);
+		return this;
+	}
+	setValueCurveAtTime(values: Array<UnitMap[Type]>, startTime: Time, duration: Time, scaling?: number): this {
+		this._param.setValueCurveAtTime(values, startTime, duration, scaling);
+		return this;
+	}
+	cancelScheduledValues(time: Time): this {
+		this._param.cancelScheduledValues(time);
+		return this;
+	}
+	cancelAndHoldAtTime(time: Time): this {
+		this._param.cancelAndHoldAtTime(time);
+		return this;
+	}
+	rampTo(value: UnitMap[Type], rampTime: Time, startTime?: Time): this {
+		this._param.rampTo(value, rampTime, startTime);
+		return this;
+	}
+
+	get value(): UnitMap[Type] {
+		return this._param.value;
+	}
+	set value(value: UnitMap[Type]) {
+		this._param.value = value;
+	}
+
+	get convert(): boolean {
+		return this._param.convert;
+	}
+	set convert(convert: boolean) {
+		this._param.convert = convert;
+	}
+
+	get units(): Unit {
+		return this._param.units;
+	}
+
+	get overridden(): boolean {
+		return this._param.overridden;
+	}
+	set overridden(overridden: boolean) {
+		this._param.overridden = overridden;
+	}
+
+	get maxValue(): UnitMap[Type] {
+		return this._param.maxValue;
+	}
+	get minValue(): UnitMap[Type] {
+		return this._param.minValue;
+	}
+}

Tone/type/Conversions.ts

@@ -0,0 +1,36 @@
+import "../type/Units";
+
+/**
+ *  Equal power gain scale. Good for cross-fading.
+ *  @param  percent (0-1)
+ */
+export function equalPowerScale(percent: NormalRange): number {
+	const piFactor = 0.5 * Math.PI;
+	return Math.sin(percent * piFactor);
+}
+
+/**
+ *  Convert decibels into gain.
+ */
+export function dbToGain(db: Decibels): GainFactor {
+	return Math.pow(10, db / 20);
+}
+
+/**
+ *  Convert gain to decibels.
+ */
+export function gainToDb(gain: GainFactor): Decibels {
+	return 20 * (Math.log(gain) / Math.LN10);
+}
+
+/**
+ * Convert an interval (in semitones) to a frequency ratio.
+ * @param interval the number of semitones above the base note
+ * @example
+ * tone.intervalToFrequencyRatio(0); // 1
+ * tone.intervalToFrequencyRatio(12); // 2
+ * tone.intervalToFrequencyRatio(-12); // 0.5
+ */
+export function intervalToFrequencyRatio(interval: Interval): number {
+	return Math.pow(2, (interval / 12));
+}

Tone/type/Time.ts

@@ -0,0 +1,127 @@
+import { TypeBase, typeBaseExpressions } from "./TypeBase";
+
+/**
+ * Tone.Time is a primitive type for encoding Time values.
+ * Tone.Time can be passed into the parameter of any method which takes time as an argument.
+ * @param  val    The time value.
+ * @param  units  The units of the value.
+ * @example
+ * var t = Time("4n");//a quarter note
+ */
+export class TimeConstructor extends TypeBase<"time"> {
+
+	protected _expressions = Object.assign({}, typeBaseExpressions, {
+		now : {
+			regexp: /^\+(.+)/,
+			method(capture): Seconds {
+				return this._now() + (new this.constructor(capture));
+			},
+		},
+		quantize: {
+			regexp: /^@(.+)/,
+			method(capture) {
+				return 0;
+				// if (Tone.Transport) {
+				// 	const quantTo = new this.constructor(capture);
+				// 	return this._secondsToUnits(Tone.Transport.nextSubdivision(quantTo));
+				// } else {
+				// }
+			},
+		},
+	});
+
+	/**
+	 * Quantize the time by the given subdivision. Optionally add a
+	 * percentage which will move the time value towards the ideal
+	 * quantized value by that percentage.
+	 * @param  val    The subdivision to quantize to
+	 * @param  percent  Move the time value towards the quantized value by a percentage.
+	 * @example
+	 * Time(21).quantize(2) //returns 22
+	 * Time(0.6).quantize("4n", 0.5) //returns 0.55
+	 */
+	quantize(subdiv: number | string | TimeObject, percent = 1): Seconds {
+		const subdivision = new TimeConstructor(subdiv).valueOf();
+		const value = this.valueOf();
+		const multiple = Math.round(value / subdivision);
+		const ideal = multiple * subdivision;
+		const diff = ideal - value;
+		return value + diff * percent;
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// CONVERSIONS
+	///////////////////////////////////////////////////////////////////////////
+	/**
+	 *  Convert a Time to Notation. The notation values are will be the
+	 *  closest representation between 1m to 128th note.
+	 *  @return {Notation}
+	 *  @example
+	 * //if the Transport is at 120bpm:
+	 * Time(2).toNotation();//returns "1m"
+	 */
+	toNotation(): Subdivision {
+		const time = this.toSeconds();
+		const testNotations: Subdivision[] = ["1m"];
+		for (let power = 1; power < 8; power++) {
+			const subdiv = Math.pow(2, power);
+			testNotations.push(subdiv + "n." as Subdivision);
+			testNotations.push(subdiv + "n" as Subdivision);
+			testNotations.push(subdiv + "t" as Subdivision);
+		}
+		// find the closets notation representation
+		let closest = testNotations[0];
+		let closestSeconds = new TimeConstructor(testNotations[0]).toSeconds();
+		testNotations.forEach(notation => {
+			const notationSeconds = new TimeConstructor(notation).toSeconds();
+			if (Math.abs(notationSeconds - time) < Math.abs(closestSeconds - time)) {
+				closest = notation;
+				closestSeconds = notationSeconds;
+			}
+		});
+		return closest;
+	}
+
+	/**
+	 *  Return the time encoded as Bars:Beats:Sixteenths.
+	 */
+	toBarsBeatsSixteenths(): BarsBeatsSixteenths {
+		const quarterTime = this._beatsToUnits(1);
+		let quarters = this.valueOf() / quarterTime;
+		quarters = parseFloat(quarters.toFixed(4));
+		const measures = Math.floor(quarters / this._getTimeSignature());
+		let sixteenths = (quarters % 1) * 4;
+		quarters = Math.floor(quarters) % this._getTimeSignature();
+		const sixteenthString = sixteenths.toString();
+		if (sixteenthString.length > 3) {
+			// the additional parseFloat removes insignificant trailing zeroes
+			sixteenths = parseFloat(parseFloat(sixteenthString).toFixed(3));
+		}
+		const progress = [measures, quarters, sixteenths];
+		return progress.join(":");
+	}
+
+	/**
+	 *  Return the time in ticks.
+	 */
+	toTicks(): Ticks {
+		const quarterTime = this._beatsToUnits(1);
+		const quarters = this.valueOf() / quarterTime;
+		return Math.round(quarters * this._getPPQ());
+	}
+
+	/**
+	 *  Return the time in seconds.
+	 */
+	toSeconds(): Seconds {
+		return this.valueOf();
+	}
+
+	/**
+	 *  Return the value as a midi note.
+	 */
+	toMidi(): MidiNote {
+		return 0;
+		// return Tone.Frequency.ftom(this.toFrequency());
+	}
+}

Tone/type/TypeBase.ts

@@ -0,0 +1,299 @@
+import { getContext } from "Tone/core/Global";
+import { isDefined, isObject , isString, isUndef } from "../core/Util";
+
+/**
+ * TypeBase is a flexible encoding of time which can be evaluated to and from a string.
+ * @param  val    The time value as a number, string or object
+ * @param  units  Unit values
+ * @example
+ * TypeBase(4, "n")
+ * TypeBase(2, "t")
+ * TypeBase("2t")
+ * TypeBase({"2t" : 2})
+ * TypeBase("2t") + TypeBase("4n");
+ */
+export abstract class TypeBase<Type extends Unit> {
+
+	/**
+	 * The value of the units
+	 */
+	private _val: string | number | TimeObject;
+
+	/**
+	 * The units of time
+	 */
+	private _units: TypeBaseUnits;
+
+	/**
+	 * All of the conversion expressions
+	 */
+	protected _expressions: TypeBaseExpression = typeBaseExpressions;
+
+	/**
+	 * The default AudioContext
+	 */
+	get defaultContext(): BaseAudioContext {
+		return getContext();
+	}
+
+	/**
+	 * The default units if none are given is seconds
+	 */
+	private _defaultUnits = "s" as TypeBaseUnits;
+
+	constructor(val: string | number | TimeObject, units?: TypeBaseUnits) {
+
+		this._val = val;
+		this._units = units || this._defaultUnits;
+
+		// test if the value is a string representation of a number
+		if (isUndef(this._units) && isString(this._val) && this._val.charAt(0) !== "+") {
+			this._val = parseFloat(this._val);
+			this._units = this._defaultUnits;
+		}
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	VALUE OF
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 *  Evaluate the time value. Returns the time in seconds.
+	 */
+	valueOf(): number {
+		if (isUndef(this._val)) {
+			return this._noArg();
+		} else if (isString(this._val) && isUndef(this._units)) {
+			for (const units in this._expressions) {
+				if (this._expressions[units].regexp.test(this._val.trim())) {
+					this._units = units as TypeBaseUnits;
+					break;
+				}
+			}
+		} else if (isObject(this._val)) {
+			let total = 0;
+			for (const typeName in this._val) {
+				if (isDefined(this._val[typeName])) {
+					const quantity = this._val[typeName];
+					// @ts-ignore
+					const time = (new this.constructor(typeName)).valueOf() * quantity;
+					total += time;
+				}
+			}
+			return total;
+		}
+		if (isDefined(this._units)) {
+			const expr = this._expressions[this._units];
+			const matching = this._val.toString().trim().match(expr.regexp);
+			if (matching) {
+				return expr.method.apply(this, matching.slice(1));
+			} else {
+				return expr.method.call(this, this._val);
+			}
+		} else if (isString(this._val)) {
+			return parseFloat(this._val);
+		} else {
+			return this._val;
+		}
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	UNIT CONVERSIONS
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 *  Returns the value of a frequency in the current units
+	 */
+	protected _frequencyToUnits(freq: Hertz): UnitMap[Type] {
+		return 1 / freq;
+	}
+
+	/**
+	 *  Return the value of the beats in the current units
+	 */
+	protected _beatsToUnits(beats): number {
+		return (60 / this._getBpm()) * beats;
+	}
+
+	/**
+	 *  Returns the value of a second in the current units
+	 */
+	protected _secondsToUnits(seconds: Seconds): UnitMap[Type] {
+		return seconds;
+	}
+
+	/**
+	 *  Returns the value of a tick in the current time units
+	 *  @private
+	 */
+	protected _ticksToUnits(ticks: Ticks): UnitMap[Type] {
+		return (ticks * (this._beatsToUnits(1)) / this._getPPQ());
+	}
+
+	/**
+	 *  With no arguments, return 'now'
+	 */
+	protected _noArg(): Seconds {
+		return this._now();
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	TEMPO CONVERSIONS
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 * Return the bpm, or 120 if Transport is not available
+	 */
+	protected _getBpm(): BPM {
+		return 120;
+	}
+
+	/**
+	 * Return the timeSignature or 4 if Transport is not available
+	 */
+	protected _getTimeSignature(): number {
+		return 4;
+	}
+
+	/**
+	 * Return the PPQ or 192 if Transport is not available
+	 */
+	protected _getPPQ(): number {
+		return 192;
+	}
+
+	/**
+	 * Return the current time in whichever context is relevant
+	 */
+	protected _now(): Seconds {
+		return this.defaultContext.currentTime;
+	}
+
+	///////////////////////////////////////////////////////////////////////////
+	// 	CONVERSION INTERFACE
+	///////////////////////////////////////////////////////////////////////////
+
+	/**
+	 *  Return the value in seconds
+	 */
+	toSeconds(): Seconds {
+		return this.valueOf();
+	}
+
+	/**
+	 *  Return the value in hertz
+	 */
+	toFrequency(): Hertz {
+		return 1 / this.toSeconds();
+	}
+
+	/**
+	 *  Return the time in samples
+	 */
+	toSamples(): Samples {
+		return this.toSeconds() * this.defaultContext.sampleRate;
+	}
+
+	/**
+	 *  Return the time in milliseconds.
+	 */
+	toMilliseconds(): Milliseconds {
+		return this.toSeconds() * 1000;
+	}
+}
+
+///////////////////////////////////////////////////////////////////////////
+// 	EXPRESSIONS
+///////////////////////////////////////////////////////////////////////////
+
+/**
+ * The units that the TypeBase can accept. extended by other classes
+ */
+type TypeBaseUnits = "s" | "n" | "t" | "m" | "i" | "hz" | "tr" | "samples" | "number";
+
+/**
+ * The format of the type conversion expressions
+ */
+type TypeBaseExpression = {
+	[key in TypeBaseUnits]: {
+		regexp: RegExp;
+		method: (value: string, ...args: any[]) => number;
+	};
+};
+
+/**
+ * All of the conversion expressions
+ */
+export const typeBaseExpressions: TypeBaseExpression = {
+	n: {
+		regexp: /^(\d+)n(\.?)$/i,
+		method(value, dot) {
+			const numericValue = parseInt(value);
+			const scalar = dot === "." ? 1.5 : 1;
+			if (numericValue === 1) {
+				return this._beatsToUnits(this._getTimeSignature()) * scalar;
+			} else {
+				return this._beatsToUnits(4 / numericValue) * scalar;
+			}
+		},
+	},
+	t: {
+		regexp: /^(\d+)t$/i,
+		method(value) {
+			const numericValue = parseInt(value);
+			return this._beatsToUnits(8 / (Math.floor(numericValue) * 3));
+		},
+	},
+	m: {
+		regexp: /^(\d+)m$/i,
+		method(value) {
+			return this._beatsToUnits(parseInt(value) * this._getTimeSignature());
+		},
+	},
+	i: {
+		regexp: /^(\d+)i$/i,
+		method(value) {
+			return this._ticksToUnits(parseInt(value));
+		},
+	},
+	hz: {
+		regexp: /^(\d+(?:\.\d+)?)hz$/i,
+		method(value) {
+			return this._frequencyToUnits(parseFloat(value));
+		},
+	},
+	tr: {
+		regexp: /^(\d+(?:\.\d+)?):(\d+(?:\.\d+)?):?(\d+(?:\.\d+)?)?$/,
+		method(m, q, s) {
+			let total = 0;
+			if (m && m !== "0") {
+				total += this._beatsToUnits(this._getTimeSignature() * parseFloat(m));
+			}
+			if (q && q !== "0") {
+				total += this._beatsToUnits(parseFloat(q));
+			}
+			if (s && s !== "0") {
+				total += this._beatsToUnits(parseFloat(s) / 4);
+			}
+			return total;
+		},
+	},
+	s: {
+		regexp: /^(\d+(?:\.\d+)?)s$/,
+		method(value) {
+			return this._secondsToUnits(parseFloat(value));
+		},
+	},
+	samples: {
+		regexp: /^(\d+)samples$/,
+		method(value) {
+			return parseInt(value) / this.context.sampleRate;
+		},
+	},
+	number: {
+		regexp: /^(\d+(?:\.\d+)?)$/,
+		method(value) {
+			return this._expressions[this._defaultUnits].method.call(this, value);
+		},
+	},
+};

Tone/type/Units.ts

@@ -0,0 +1,158 @@
+/**
+ * A note in Scientific pitch notation.
+ * The pitch class + octave number
+ * e.g. "C4", "D#3", "G-1"
+ */
+type Note = string;
+
+/**
+ * A number representing a time in seconds
+ */
+type Seconds = number;
+
+/**
+ * A number used to measure the intensity of a sound on a logarithmic scale.
+ */
+type Decibels = number;
+
+/**
+ * A number that is between [0, 1]
+ */
+type NormalRange = number;
+
+/**
+ * A number that is between [-1, 1]
+ */
+type AudioRange = number;
+
+/**
+ *  Half-step note increments, i.e. 12 is an octave above the root. and 1 is a half-step up.
+ */
+type Interval = number;
+
+/**
+ * A number representing the multiplication factor applied to a signal
+ */
+type GainFactor = number;
+
+/**
+ * A number greater than or equal to 0.
+ */
+type Positive = number;
+
+/**
+ * Represents a subdivision of a measure.
+ * The number represents the subdivision. "t" represents a triplet.
+ * e.g. "4n" is a quarter note, and "4t" is a quarter note triplet.
+ */
+type Subdivision = "1m" | "1n" | "2n" | "2t" | "4n" | "4t" | "8n" | "8t" | "16n" | "16t" |
+					"32n" | "32t" | "64n" | "64t" | "128n" | "128t" | "256n" | "256t";
+
+/**
+ * A time object has a subdivision as the keys and a number as the values.
+ * The
+ */
+type TimeObject = {
+	[sub in Subdivision]: number;
+};
+
+/**
+ *  Time can be described in a number of ways. Read more [Time](https://github.com/Tonejs/Tone.js/wiki/Time).
+ *
+ *  * Numbers, which will be taken literally as the time (in seconds).
+ *  * Notation, ("4n", "8t") describes time in BPM and time signature relative values.
+ *  * TransportTime, ("4:3:2") will also provide tempo and time signature relative times
+ *  in the form BARS:QUARTERS:SIXTEENTHS.
+ *  * Frequency, ("8hz") is converted to the length of the cycle in seconds.
+ *  * Now-Relative, ("+1") prefix any of the above with "+" and it will be interpreted as
+ *  "the current time plus whatever expression follows".
+ *  * Object, ({"4n" : 3, "8t" : -1}). The resulting time is equal to
+ * 	the sum of all of the keys multiplied by the values in the object.
+ *  * No Argument, for methods which accept time, no argument will be interpreted as
+ *  "now" (i.e. the currentTime).
+ */
+type Time = Seconds | TimeObject | Subdivision | undefined;
+
+/**
+ *  Frequency can be described similar to time, except ultimately the
+ *  values are converted to frequency instead of seconds. A number
+ *  is taken literally as the value in hertz. Additionally any of the
+ *  Time encodings can be used. Note names in the form
+ *  of NOTE OCTAVE (i.e. C4) are also accepted and converted to their
+ *  frequency value.
+ */
+type Frequency = Time | Note;
+
+/**
+ *  TransportTime describes a position along the Transport's timeline. It is
+ *  similar to Time in that it uses all the same encodings, but TransportTime specifically
+ *  pertains to the Transport's timeline, which is startable, stoppable, loopable, and seekable.
+ *  [Read more](https://github.com/Tonejs/Tone.js/wiki/TransportTime)
+ */
+type TransportTime = Time;
+
+/**
+ *  Ticks are the basic subunit of the Transport. They are
+ *  the smallest unit of time that the Transport supports.
+ */
+type Ticks = number;
+
+/**
+ *  Beats per minute
+ */
+type BPM = number;
+
+/**
+ *  Angle between 0 and 360.
+ */
+type Degrees = number;
+/**
+ *  A number representing a midi note.
+ */
+type MidiNote = number;
+
+/**
+ *  A colon-separated representation of time in the form of
+ *  Bars:Beats:Sixteenths.
+ */
+type BarsBeatsSixteenths  = string;
+/**
+ *  Sampling is the reduction of a continuous signal to a discrete signal.
+ *  Audio is typically sampled 44100 times per second.
+ */
+type Samples = number;
+
+/**
+ *  Hertz are a frequency representation defined as one cycle per second.
+ */
+type Hertz = number;
+
+/**
+ *  One millisecond is a thousandth of a second.
+ */
+type Milliseconds = number;
+
+/**
+ * Map the unit name to a unit value
+ */
+interface UnitMap {
+	number: number;
+	decibels: Decibels;
+	normalRange: NormalRange;
+	audioRange: AudioRange;
+	gain: GainFactor;
+	positive: Positive;
+	time: Time;
+	frequency: Frequency;
+	transportTime: TransportTime;
+	ticks: Ticks;
+	bpm: BPM;
+	degrees: Degrees;
+	samples: Samples;
+	hertz: Hertz;
+}
+
+/**
+ * All of the units names
+ */
+type Unit = keyof UnitMap;

Tone/version.ts

@@ -0,0 +1 @@
+export const version = "dev";

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tone",
-  "version": "13.8.0",
+  "version": "14.0.0",
   "description": "A Web Audio framework for making interactive music in the browser.",
   "main": "build/Tone.js",
   "files": [
@@ -19,9 +19,8 @@
     "collect:tests": "node scripts/collect_tests.js --file $npm_config_file --dir $npm_config_dir",
     "increment": "node scripts/increment_version.js",
     "karma": "karma start scripts/karma.conf.js --single-run",
-    "karma:watch": "karma start scripts/karma.conf.js --auto-watch",
-    "lint": "eslint Tone/*/*.js",
-    "lint:fix": "eslint Tone/*/*.js --fix",
+    "karma:watch": "karma start scripts/karma.conf.js --auto-watch --browsers Chrome",
+    "lint:fix": "eslint Tone/*/*.ts --fix",
     "scratch": "webpack -w --env.scratch --mode=development",
     "test": "npm run collect:tests && npm run karma",
     "test:watch": "npm run collect:tests && npm run karma:watch",
@@ -30,6 +29,8 @@
     "test:html": "mocha ./test/html/testHTML.js --timeout 30000",
     "test:node": "node ./test/html/node_test.js",
     "tsd": "node ./scripts/generate_docs.js",
+    "lint": "tslint --project tslint.json",
+    "tsc:watch": "tsc --watch",
     "watch": "npm run increment && npm run collect:deps && webpack -w --env.production --mode=development"
   },
   "repository": {
@@ -54,8 +55,14 @@
   },
   "devDependencies": {
     "@babel/polyfill": "^7.0.0-beta.47",
+    "@tonejs/plot": "0.0.20",
+    "@types/chai": "^4.1.7",
+    "@types/mocha": "^5.2.6",
+    "@types/ua-parser-js": "^0.7.32",
+    "@typescript-eslint/eslint-plugin": "^1.5.0",
+    "@typescript-eslint/parser": "^1.5.0",
     "audiobuffer-to-wav": "^1.0.0",
-    "chai": "^1.9.1",
+    "chai": "^1.10.0",
     "codecov": "^3.1.0",
     "concurrently": "^3.5.1",
     "eslint": "^5.13.0",
@@ -66,19 +73,21 @@
     "http-server": "^0.11.1",
     "istanbul-instrumenter-loader": "^3.0.1",
     "jsdoc": "^3.5.5",
-    "karma": "^4.0.0",
+    "karma": "^4.0.1",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage": "^1.1.1",
     "karma-firefox-launcher": "^1.1.0",
     "karma-mocha": "^1.3.0",
     "karma-safari-launcher": "^1.0.0",
     "karma-sourcemap-loader": "^0.3.7",
-    "karma-webpack": "^3.0.5",
+    "karma-typescript": "^4.0.0",
     "mocha": "^5.1.1",
     "proxy-polyfill": "^0.2.0",
     "semver": "^5.5.0",
     "teoria": "^2.5.0",
     "tsd-jsdoc": "^2.1.2",
+    "tslint": "^5.14.0",
+    "typescript": "^3.3.4000",
     "ua-parser-js": "^0.7.19",
     "webpack": "^4.6.0",
     "webpack-cli": "^3.1.2",

scripts/karma.conf.js

@@ -1,7 +1,7 @@
 // Karma configuration
-var path = require("path");
+const path = require("path");
 
-var BROWSERS = ["HeadlessChrome", "HeadlessFirefox", "Safari"];
+let BROWSERS = ["HeadlessChrome", "HeadlessFirefox", "Safari"];
 
 if (process.env.BROWSER === "chrome") {
 	BROWSERS = ["HeadlessChrome"];
@@ -14,83 +14,88 @@ if (process.env.BROWSER === "chrome"){
 }
 
 module.exports = function(config) {
-	var configuration = {
+	const configuration = {
 
 		// base path that will be used to resolve all patterns (eg. files, exclude)
 		basePath : "../",
 
 		// frameworks to use
 		// available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-		frameworks : ["mocha"],
+		frameworks : ["mocha", "karma-typescript"],
 
 		// list of files / patterns to load in the browser
 		files : [
-			"test/test.js",
-			{ pattern : "test/audio/*", included : false },
-			{ pattern : "test/audio/*/*", included : false },
-			{ pattern : "test/html/*", included : false },
-			{ pattern : "build/*", included : false },
+			"test/**/*.ts",
+			"Tone/**/*.ts",
+			{ pattern : "test/audio/**", included : false },
+			{ pattern : "test/html/**", included : false },
 		],
 
+		// Karma Typescript compiler options
+		karmaTypescriptConfig: {
+			compilerOptions : {
+				// baseUrl: ".",
+				// module: "commonjs",
+				// paths : {
+				// 	"../Tone" : ["./Tone"],
+				// 	// "@tonejs/plot": ["./node_modules/@tonejs/plot/dist/index.d.ts"],
+				// },
+			},
+			bundlerOptions: {
+				resolve: {
+					directories: ["Tone", "node_modules", "test"],
+				},
+			},
+			coverageOptions : {
+				exclude: /test\/.*\.ts$/i,
+			},
+			reports: {
+				html: path.resolve(__dirname, "../coverage"),
+				lcovonly: path.resolve(__dirname, "../coverage"),
+			},
+			tsconfig: "./tsconfig.json",
+		},
+
 		// list of files to exclude
-		exclude : [],
+		exclude : [
+			"node_modules/*",
+		],
 
 		// preprocess matching files before serving them to the browser
 		// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
 		preprocessors: {
-			"test/test.js" : ["webpack", "sourcemap"],
+			"**/*.ts": "karma-typescript",
+			// "Tone/**/*.ts": "coverage",
 		},
 
 		// test results reporter to use
 		// possible values: 'dots', 'progress'
 		// available reporters: https://npmjs.org/browse/keyword/karma-reporter
-		reporters : ["dots", "coverage"],
+		reporters : ["dots", "karma-typescript"],
 
-		coverageReporter : {
-			type : "lcov",
-			dir : "./coverage"
-		},
+		// coverageReporter : {
+		// 	type : "lcov",
+		// 	dir: path.resolve(__dirname, "../coverage"),
+		// },
 
 		//plugins
 		plugins : [
-			"karma-coverage",
+			"karma-typescript",
+			// "karma-coverage",
 			"karma-mocha",
-			"karma-webpack",
 			"karma-chrome-launcher",
 			"karma-firefox-launcher",
 			"karma-safari-launcher",
-			"karma-sourcemap-loader",
+			// "karma-sourcemap-loader",
 		],
 
 		client : {
 			mocha : {
+				grep: "Gain",
+				timeout : 30000,
 				reporter : "html", // change Karma's debug.html to the mocha web reporter
-				ui : "bdd"
-			}
+				ui : "bdd",
 			},
-
-		//webpack
-		webpack : {
-			mode : "development",
-			resolve : {
-				modules : [
-					path.resolve(__dirname, "../node_modules"),
-					path.resolve(__dirname, "../"),
-					path.resolve(__dirname, "../test")
-				],
-			},
-			module : {
-				rules : [
-					//enables correct coverage mapping
-					{
-						test : /\.js$/,
-						use : { loader : "istanbul-instrumenter-loader", query : { esModules : true } },
-						include : path.resolve(__dirname, "../Tone"),
-						exclude : path.resolve(__dirname, "../Tone/shim")
-					}
-				]
-			},
-			devtool : "inline-source-map"
 		},
 
 		// web server port
@@ -127,17 +132,18 @@ module.exports = function(config){
 		customLaunchers : {
 			HeadlessChrome : {
 				base : "ChromeHeadless",
-				flags : ["--no-sandbox", "--use-fake-ui-for-media-stream", "--use-fake-device-for-media-stream", "--autoplay-policy=no-user-gesture-required"]
+				flags : ["--no-sandbox", "--use-fake-ui-for-media-stream", "--use-fake-device-for-media-stream",
+						"--autoplay-policy=no-user-gesture-required"],
 			},
 			HeadlessFirefox : {
 				base : "Firefox",
 				flags : ["-headless"],
 				prefs : {
+					"focusmanager.testmode" : true,
 					"media.navigator.permission.disabled" : true,
-					"focusmanager.testmode" : true
-				}
-			}
-		}
+				},
+			},
+		},
 	};
 
 	config.set(configuration);

test/core/Connect.ts

@@ -0,0 +1,109 @@
+import { PassesAudio } from "@tonejs/plot";
+import { expect } from "chai";
+import { connect, disconnect } from "../../Tone/core/Connect";
+import { Gain } from "../../Tone/node/Gain";
+
+describe("Connect", () => {
+
+	context("native node", () => {
+
+		it("can create a connection", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				connect(input, output);
+			})).to.equal(true);
+		});
+
+		it("can disconnect two nodes", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				connect(input, output);
+				disconnect(input, output);
+			})).to.equal(false);
+		});
+
+		it("can disconnect a node", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				connect(input, output);
+				disconnect(input);
+			})).to.equal(false);
+		});
+
+		it("can connect one channel to another", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				const merge = context.createChannelMerger(2);
+				const split = context.createChannelSplitter(2);
+				connect(input, merge, 0, 1);
+				connect(merge, split, 0, 0);
+				connect(split, output, 1, 0);
+			})).to.equal(true);
+		});
+
+		it("can disconnect from an explicit channel", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				const merge = context.createChannelMerger(2);
+				const split = context.createChannelSplitter(2);
+				connect(input, merge, 0, 1);
+				connect(merge, split, 0, 0);
+				connect(split, output, 1, 0);
+				disconnect(split, output, 1, 0);
+			})).to.equal(false);
+		});
+
+		it("throws an error if things aren't connected", async () => {
+			let threwError = false;
+			await PassesAudio((context, input, output) => {
+				disconnect(input, output);
+			}).catch(() => threwError = true);
+			expect(threwError).to.equal(true);
+		});
+
+		it("throws an error if things aren't connected to a specific channel", async () => {
+			let threwError = false;
+			await PassesAudio((context, input, output) => {
+				const merge = context.createChannelMerger(2);
+				const split = context.createChannelSplitter(2);
+				connect(input, merge, 0, 1);
+				connect(merge, split, 0, 0);
+				connect(split, output, 1, 0);
+				disconnect(split, output, 0, 0);
+			}).catch(() => threwError = true);
+			expect(threwError).to.equal(true);
+		});
+	});
+
+	context("ToneAudioNode", () => {
+		it("can create a connection", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				const gain = new Gain({
+					context,
+				});
+				connect(input, gain);
+				connect(gain, output);
+			})).to.equal(true);
+		});
+
+		it("can disconnect a node", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				const gain = new Gain({
+					context,
+				});
+				connect(input, gain);
+				connect(gain, output);
+				connect(gain, output);
+				disconnect(gain);
+			})).to.equal(false);
+		});
+
+		it("can disconnect a node explicitly", async () => {
+			expect(await PassesAudio((context, input, output) => {
+				const gain = new Gain({
+					context,
+				});
+				connect(input, gain);
+				connect(gain, output);
+				connect(gain, output);
+				disconnect(gain, output);
+			})).to.equal(false);
+		});
+	});
+
+});

test/core/ContextTicker.ts

@@ -0,0 +1,86 @@
+import { expect } from "chai";
+import { Ticker } from "../../Tone/core/ContextTicker";
+import { ONLINE_TESTING } from "../helper/Supports";
+
+describe("Ticker", () => {
+
+	function empty(): void {
+		// do nothing
+	}
+
+	it("can be created and disposed", () => {
+		const ticker = new Ticker(empty, "offline", 1);
+		ticker.dispose();
+	});
+
+	it("can adjust the type", () => {
+		const ticker = new Ticker(empty, "worker", 0.1);
+		expect(ticker.type).to.equal("worker");
+		ticker.type = "timeout";
+		expect(ticker.type).to.equal("timeout");
+		ticker.type = "offline";
+		expect(ticker.type).to.equal("offline");
+		ticker.dispose();
+	});
+
+	it("can get/set the updateInterval", () => {
+		const ticker = new Ticker(empty, "worker", 0.1);
+		expect(ticker.updateInterval).to.equal(0.1);
+		ticker.updateInterval = 0.5;
+		expect(ticker.updateInterval).to.equal(0.5);
+		ticker.dispose();
+	});
+
+	if (ONLINE_TESTING) {
+
+		context("timeout", () => {
+
+			it("provides a callback when set to timeout", done => {
+				const ticker = new Ticker(() => {
+					ticker.dispose();
+					done();
+				}, "timeout", 0.01);
+			});
+
+			it("can adjust the interval when set to timeout", (done) => {
+				const ticker = new Ticker(() => {
+					ticker.dispose();
+					done();
+				}, "timeout", 0.01);
+				ticker.updateInterval = 0.1;
+			});
+		});
+	}
+
+	context("worker", () => {
+
+		it("provides a callback when set to worker", done => {
+			const ticker = new Ticker(() => {
+				ticker.dispose();
+				done();
+			}, "worker", 0.01);
+		});
+
+		it("falls back to timeout if the constructor throws an error", done => {
+			const URL = window.URL;
+			// @ts-ignore
+			window.URL = null;
+			const ticker = new Ticker(() => {
+				expect(ticker.type).to.equal("timeout");
+				ticker.dispose();
+				window.URL = URL;
+				done();
+			}, "worker", 0.01);
+
+		});
+
+		it("can adjust the interval when set to worker", (done) => {
+			const ticker = new Ticker(() => {
+				ticker.dispose();
+				done();
+			}, "worker", 0.01);
+			ticker.updateInterval = 0.1;
+		});
+
+	});
+});

test/core/Emitter.ts

@@ -0,0 +1,87 @@
+import { expect } from "chai";
+import { Emitter } from "../../Tone/core/Emitter";
+
+describe("Emitter", () => {
+
+	it("can be created and disposed", () => {
+		const emitter = new Emitter();
+		emitter.dispose();
+	});
+
+	it("can bind events", done => {
+		const emitter = new Emitter();
+		emitter.on("something", () => {
+			done();
+			emitter.dispose();
+		});
+		emitter.emit("something");
+		emitter.dispose();
+	});
+
+	it("can unbind events", () => {
+		const emitter = new Emitter();
+		const callback = () => {
+			throw new Error("should call this");
+		};
+		emitter.on("something", callback);
+		emitter.off("something", callback);
+		emitter.emit("something");
+		emitter.dispose();
+	});
+
+	it("removes all events when no callback is given", () => {
+		const emitter = new Emitter();
+		emitter.on("something", () => {
+			throw new Error("should call this");
+		});
+		emitter.on("something", () => {
+			throw new Error("should call this");
+		});
+		emitter.off("something");
+		emitter.emit("something");
+		emitter.off("something-else");
+		emitter.dispose();
+	});
+
+	it("can remove an event while emitting", done => {
+		const emitter = new Emitter();
+		emitter.on("something", () => {
+			emitter.off("something");
+		});
+		emitter.on("something-else", () => {
+			emitter.dispose();
+			done();
+		});
+		emitter.emit("something");
+		emitter.emit("something-else");
+	});
+
+	it("can invoke an event once", () => {
+		const emitter = new Emitter();
+		emitter.once("something", val => {
+			expect(val).to.equal(1);
+		});
+		emitter.emit("something", 1);
+		emitter.emit("something", 2);
+		emitter.dispose();
+	});
+
+	it("can pass arguments to the callback", done => {
+		const emitter = new Emitter();
+		emitter.on("something", (arg0, arg1) => {
+			expect(arg0).to.equal("A");
+			expect(arg1).to.equal("B");
+			emitter.dispose();
+			done();
+		});
+		emitter.emit("something", "A", "B");
+	});
+
+	// it("can mixin its methods to another object", done => {
+	// 	const emitter = {};
+	// 	Emitter.mixin(emitter);
+	// 	emitter.on("test", done);
+	// 	emitter.emit("test");
+	// });
+});
+

test/core/Timeline.ts

@@ -0,0 +1,593 @@
+// import Test from "helper/Test";
+import { expect } from "chai";
+import { Timeline } from "Tone/core/Timeline";
+
+interface TimelineStateEvent {
+	state: string;
+	time: number;
+}
+
+interface TimelineNameEvent {
+	name: string;
+	time: number;
+}
+
+interface TimelineAddedEvent {
+	time: number;
+	added?: boolean;
+}
+
+interface TimelineValueEvent {
+	time: number;
+	value: any;
+}
+
+describe("Timeline", () => {
+
+	it("can be created and disposed", () => {
+		const sched = new Timeline();
+		sched.dispose();
+	});
+
+	it("accepts events into the timeline", () => {
+
+		const sched = new Timeline<TimelineStateEvent>();
+		sched.add({
+			state : "A",
+			time : 0,
+		});
+		sched.add({
+			state : "B",
+			time : 1,
+		});
+		sched.add({
+			state : "C",
+			time : 2,
+		});
+		sched.dispose();
+	});
+
+	it("can insert events in the timeline in the right order", () => {
+		const sched = new Timeline();
+		sched.add({
+			time : 0,
+		});
+		sched.add({
+			time : 2,
+		});
+		sched.add({
+			time : 1,
+		});
+		let index = 0;
+		const eventTimes = [0, 1, 2];
+		sched.forEach((event) => {
+			expect(event.time).to.equal(eventTimes[index++]);
+		});
+		sched.dispose();
+	});
+
+	it("can get the length of the timeline", () => {
+		const sched = new Timeline();
+		expect(sched.length).to.equal(0);
+		sched.add({
+			time : 0,
+		});
+		expect(sched.length).to.equal(1);
+		sched.dispose();
+	});
+
+	it("can remove items from the timeline", () => {
+		const sched = new Timeline();
+		const obj = { time : 0 };
+		sched.add(obj);
+		sched.add({
+			time : 2,
+		});
+		expect(sched.length).to.equal(2);
+		sched.remove(obj);
+		expect(sched.length).to.equal(1);
+		sched.dispose();
+	});
+
+	it("has no effect to remove an object which is not there", () => {
+		const sched = new Timeline();
+		sched.add({
+			time : 2,
+		});
+		sched.remove({time : 1});
+		expect(sched.length).to.equal(1);
+		sched.forEach((event) => {
+			sched.remove({time : 4});
+		});
+		expect(sched.length).to.equal(1);
+		sched.dispose();
+	});
+
+	it("can search for events in the timeline by time", () => {
+		const sched = new Timeline();
+		sched.add({
+			time : 0,
+		});
+		sched.add({
+			time : 2,
+		});
+		sched.add({
+			time : 1,
+		});
+		// expect(sched._search(0)).to.equal(0);
+		// expect(sched._search(0.01)).to.equal(0);
+		// expect(sched._search(1)).to.equal(1);
+		// expect(sched._search(1.01)).to.equal(1);
+		// expect(sched._search(2)).to.equal(2);
+		// expect(sched._search(20000)).to.equal(2);
+		// expect(sched._search(-1)).to.equal(-1);
+		sched.dispose();
+	});
+
+	it("can get a previous event", () => {
+		const sched = new Timeline();
+		const event0 = {
+			time : 0,
+		};
+		const event1 = {
+			time : 1,
+		};
+		sched.add(event0);
+		sched.add(event1);
+		expect(sched.previousEvent(event1)).to.equal(event0);
+		expect(sched.previousEvent(event0)).to.equal(null);
+		sched.dispose();
+	});
+
+	it("can get the scheduled event at the given time", () => {
+		const sched = new Timeline<TimelineStateEvent>();
+		sched.add({
+			state : "A",
+			time : 2,
+		});
+		sched.add({
+			state : "C",
+			time : 9.4,
+		});
+		sched.add({
+			state : "B",
+			time : 6,
+		});
+		expect(sched.get(0)).is.null;
+		const e1 = sched.get(2);
+		const e2 = sched.get(5.9);
+		const e3 = sched.get(6.1);
+		const e4 = sched.get(12);
+		if (e1 && e2 && e3 && e4) {
+			expect(e1.state).is.equal("A");
+			expect(e2.state).is.equal("A");
+			expect(e3.state).is.equal("B");
+			expect(e4.state).is.equal("C");
+		} else {
+			throw new Error("expected 4 events");
+		}
+		sched.dispose();
+	});
+
+	it("puts the second scheduled event after if two events are scheduled at the same time", () => {
+		const sched = new Timeline<TimelineNameEvent>();
+		sched.add({
+			name : "A",
+			time : 0,
+		});
+		sched.add({
+			name : "B",
+			time : 0,
+		});
+		const firstEvent0 = sched.get(0);
+		if (firstEvent0) {
+			expect(firstEvent0.name).is.equal("B");
+		}
+		sched.add({
+			name : "C",
+			time : 0,
+		});
+		const firstEvent1 = sched.get(0);
+		if (firstEvent1) {
+			expect(firstEvent1.name).is.equal("C");
+		}
+		sched.dispose();
+	});
+
+	it("can the next event after the given time", () => {
+		const sched = new Timeline<TimelineStateEvent>();
+		expect(sched.getAfter(0)).is.null;
+		sched.add({
+			state : "A",
+			time : 0.1,
+		});
+		sched.add({
+			state : "B",
+			time : 1.1,
+		});
+		sched.add({
+			state : "C",
+			time : 2.1,
+		});
+		const firstEvent = sched.getAfter(0);
+		const secondEvent = sched.getAfter(1);
+		if (firstEvent && secondEvent) {
+			expect(firstEvent.state).is.equal("A");
+			expect(secondEvent.state).is.equal("B");
+		} else {
+			throw new Error("should have 2 events");
+		}
+		expect(sched.getAfter(3)).is.null;
+		sched.dispose();
+	});
+
+	it("can the event before the event before the given time", () => {
+		const sched = new Timeline<TimelineStateEvent>();
+		expect(sched.getBefore(0)).is.null;
+		sched.add({
+			state : "A",
+			time : 0.1,
+		});
+		sched.add({
+			state : "B",
+			time : 1.1,
+		});
+		sched.add({
+			state : "C",
+			time : 2.1,
+		});
+		expect(sched.getBefore(0)).is.null;
+		const firstEvent = sched.getBefore(1.1);
+		const secondEvent = sched.getBefore(2.1);
+		const thirdEvent = sched.getBefore(3);
+		if (firstEvent && secondEvent && thirdEvent) {
+			expect(firstEvent.state).is.equal("A");
+			expect(secondEvent.state).is.equal("B");
+			expect(thirdEvent.state).is.equal("C");
+		} else {
+			throw new Error("should have 3 events");
+		}
+		sched.dispose();
+	});
+
+	it("can cancel an item", () => {
+		const sched = new Timeline();
+		sched.add({ time : 3 });
+		sched.add({ time : 5 });
+		sched.add({ time : 4 });
+		sched.add({ time : 8 });
+		sched.add({ time : 5 });
+		expect(sched.length).to.equal(5);
+		sched.cancel(10);
+		expect(sched.length).to.equal(5);
+		sched.cancel(5);
+		expect(sched.length).to.equal(2);
+		sched.cancel(3);
+		expect(sched.length).to.equal(0);
+		sched.dispose();
+	});
+
+	it("can cancel items after the given time", () => {
+		const sched = new Timeline();
+		for (let i = 0; i < 100; i++) {
+			sched.add({ time : 100 - i });
+		}
+		sched.cancel(10);
+		expect(sched.length).to.equal(9);
+		sched.cancel(5);
+		expect(sched.length).to.equal(4);
+		sched.cancel(0);
+		expect(sched.length).to.equal(0);
+		sched.dispose();
+	});
+
+	it("can cancel items before the given time", () => {
+		const sched = new Timeline();
+		for (let i = 0; i < 100; i++) {
+			sched.add({ time : i });
+		}
+		sched.cancelBefore(9);
+		expect(sched.length).to.equal(90);
+		sched.cancelBefore(10.1);
+		expect(sched.length).to.equal(89);
+		sched.cancelBefore(100);
+		expect(sched.length).to.equal(0);
+		sched.dispose();
+	});
+
+	it("has no problem with many items", () => {
+		const sched = new Timeline();
+		for (let i = 0; i < 10000; i++) {
+			sched.add({
+				time : i,
+			});
+		}
+		for (let j = 0; j < 1000; j++) {
+			const val = sched.get(j);
+			if (val) {
+				expect(val.time).to.equal(j);
+			}
+		}
+		sched.dispose();
+	});
+
+	it("can constrain the length of the timeline", () => {
+		const sched = new Timeline(4);
+		for (let i = 0; i < 10000; i++) {
+			sched.add({
+				time : i,
+			});
+		}
+		expect(sched.length).to.equal(4);
+		sched.dispose();
+	});
+
+	it("can peek and shift off the first element", () => {
+		const timeline = new Timeline<TimelineValueEvent>();
+		timeline.add({
+			time : 0,
+			value : "a",
+		});
+		timeline.add({
+			time : 1,
+			value : "b",
+		});
+		timeline.add({
+			time : 2,
+			value : "c",
+		});
+		expect(timeline.length).to.equal(3);
+		const peekValue = timeline.peek();
+		if (peekValue) {
+			expect(peekValue.value).to.equal("a");
+		} else {
+			throw new Error("should have value");
+		}
+		expect(timeline.length).to.equal(3);
+
+		const shiftValue = timeline.shift();
+		if (shiftValue) {
+			expect(shiftValue.value).to.equal("a");
+		} else {
+			throw new Error("should have value");
+		}
+		expect(timeline.length).to.equal(2);
+		const peekValue2 = timeline.peek();
+		if (peekValue2) {
+			expect(peekValue2.value).to.equal("b");
+		} else {
+			throw new Error("should have value");
+		}
+		const shiftValue2 = timeline.shift();
+		if (shiftValue2) {
+			expect(shiftValue2.value).to.equal("b");
+		} else {
+			throw new Error("should have value");
+		}
+		expect(timeline.length).to.equal(1);
+		timeline.dispose();
+	});
+
+	context("Iterators", () => {
+
+		it("iterates over all items and returns and item", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0 });
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEach((event) => {
+				expect(event).to.be.an("object");
+				count++;
+			});
+			expect(count).to.equal(5);
+			sched.dispose();
+		});
+
+		it("iterates over all items before the given time", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0 });
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachBefore(0.3, (event) => {
+				expect(event).to.be.an("object");
+				expect(event.time).to.be.at.most(0.3);
+				count++;
+			});
+			expect(count).to.equal(4);
+			sched.dispose();
+		});
+
+		it("handles time ranges before the available objects", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachBefore(0, () => {
+				count++;
+			});
+			expect(count).to.equal(0);
+			sched.dispose();
+		});
+
+		it("iterates over all items after the given time", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0 });
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachAfter(0.1, (event) => {
+				expect(event).to.be.an("object");
+				expect(event.time).to.be.above(0.1);
+				count++;
+			});
+			expect(count).to.equal(3);
+			sched.dispose();
+		});
+
+		it("handles time ranges after the available objects", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachAfter(0.5, () => {
+				count++;
+			});
+			expect(count).to.equal(0);
+			sched.dispose();
+		});
+
+		it("handles time ranges before the first object", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachAfter(-Infinity, () => {
+				count++;
+			});
+			expect(count).to.equal(4);
+			sched.dispose();
+		});
+
+		it("can iterate after inclusive of the item at the given time", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachFrom(0.2, () => {
+				count++;
+			});
+			expect(count).to.equal(4);
+			count = 0;
+			sched.forEachFrom(0.21, () => {
+				count++;
+			});
+			expect(count).to.equal(2);
+			count = 0;
+			sched.forEachFrom(0, () => {
+				count++;
+			});
+			expect(count).to.equal(5);
+			sched.dispose();
+		});
+
+		it("iterates over all items at the given time", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0 });
+			sched.add({ time : 0 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachAtTime(0.1, (event) => {
+				count++;
+			});
+			expect(count).to.equal(0);
+			// and with an actual time
+			sched.forEachAtTime(0.2, (event) => {
+				expect(event.time).to.equal(0.2);
+				count++;
+			});
+			expect(count).to.equal(2);
+			sched.dispose();
+		});
+
+		it("can remove items during iterations", () => {
+			const sched = new Timeline();
+			for (let i = 0; i < 1000; i++) {
+				sched.add({ time : i });
+			}
+			sched.forEach((event) => {
+				sched.remove(event);
+			});
+			expect(sched.length).to.equal(0);
+			sched.dispose();
+		});
+
+		it("can add items during iteration", () => {
+			interface AddedInterface {
+				time: number;
+				added?: boolean;
+			}
+			const sched = new Timeline<AddedInterface>();
+			for (let i = 0; i < 1000; i++) {
+				sched.add({ time : i });
+			}
+			let added = false;
+			sched.forEach((event) => {
+				if (!added) {
+					added = true;
+					sched.add({
+						added : true,
+						time : 10,
+					});
+				}
+			});
+			expect(sched.length).to.equal(1001);
+			sched.dispose();
+		});
+
+		it("can iterate between a time range", () => {
+			const sched = new Timeline();
+			sched.add({ time : 0.1 });
+			sched.add({ time : 0.2 });
+			sched.add({ time : 0.3 });
+			sched.add({ time : 0.4 });
+			let count = 0;
+			sched.forEachBetween(0.2, 0.4, (event) => {
+				count++;
+				expect(event.time).to.be.within(0.2, 0.3);
+			});
+			expect(count).to.equal(2);
+			count = 0;
+			sched.forEachBetween(0.21, 0.4, (event) => {
+				count++;
+				expect(event.time).to.be.within(0.21, 0.3);
+			});
+			expect(count).to.equal(1);
+			count = 0;
+			sched.forEachBetween(0.21, 0.39, (event) => {
+				count++;
+				expect(event.time).to.be.within(0.21, 0.39);
+			});
+			expect(count).to.equal(1);
+			count = 0;
+			sched.forEachBetween(0, 0.11, (event) => {
+				count++;
+				expect(event.time).to.be.within(0, 0.11);
+			});
+			expect(count).to.equal(1);
+			count = 0;
+			sched.forEachBetween(0, 0.09, (event) => {
+				count++;
+				expect(event.time).to.be.within(0, 0.09);
+			});
+			expect(count).to.equal(0);
+			count = 0;
+			sched.forEachBetween(0.41, 0.5, (event) => {
+				count++;
+				expect(event.time).to.be.within(0.41, 0.5);
+			});
+			expect(count).to.equal(0);
+			sched.dispose();
+		});
+
+	});
+});
+

test/helper/Basic.ts

@@ -0,0 +1,40 @@
+import { expect } from "chai";
+import { Tone } from "../../Tone/core/Tone";
+import { AudioProcessor } from "../../Tone/node/AudioProcessor";
+
+export const testAudioContext = new OfflineAudioContext(1, 1, 11025);
+
+export function BasicTests(Constr, ...args: any[]) {
+
+	context("Basic", () => {
+
+		it("can be created and disposed", () => {
+			const instance = new Constr(...args);
+			instance.dispose();
+		});
+
+		it("extends Tone", () => {
+			const instance = new Constr(...args);
+			expect(instance).to.be.an.instanceof(Tone);
+			instance.dispose();
+		});
+
+		it("can specify the AudioContext", () => {
+			const instance = new Constr(Object.assign({
+				context: testAudioContext,
+			}, ...args));
+			if (instance instanceof AudioProcessor) {
+				expect(instance.context).to.equal(testAudioContext);
+				// also check all of it's attributes to see if they also have the right context
+				for (const member in instance) {
+					if (instance[member] instanceof AudioProcessor) {
+						expect(instance[member].context).to.equal(testAudioContext);
+					}
+				}
+			}
+			instance.dispose();
+		});
+
+	});
+
+}

test/helper/Connect.ts

@@ -0,0 +1,10 @@
+import { getContext } from "../../Tone/core/Global";
+import { Gain } from "../../Tone/node/Gain";
+
+export function connectFrom(): Gain {
+	return new Gain();
+}
+
+export function connectTo(): Gain {
+	return new Gain();
+}

test/helper/ConstantOutput.ts

@@ -0,0 +1,13 @@
+import { expect } from "chai";
+import { Offline } from "./Offline";
+
+/**
+ * Test that the output of the callback is a constant value
+ */
+export async function ConstantOutput(
+	callback: (context: BaseAudioContext) => Promise<void> | void,
+	value: number, threshold = 0.01,
+): Promise<void> {
+	const buffer = await Offline(callback, 0.01, 1);
+	expect(buffer.value()).to.be.closeTo(value, threshold);
+}

test/helper/Dispose.ts

@@ -0,0 +1,17 @@
+export function isDisposed(instance){
+	for (let prop in instance) {
+		const member = instance[prop];
+		if (typeof member !== "function" &&
+			typeof member !== "string" &&
+			typeof member !== "number" &&
+			typeof member !== "boolean" &&
+			typeof member !== "undefined" &&
+			prop !== "preset" &&
+			!(member instanceof AudioContext) &&
+			!instance.constructor.prototype[prop]) {
+			if (member !== null) {
+				throw Error("property was not completely disposed: " + prop);
+			}
+		}
+	}
+}

test/helper/Offline.ts

@@ -0,0 +1,15 @@
+import { Offline as PlotOffline } from "@tonejs/plot";
+import { getContext, setContext } from "../../Tone/core/Global";
+
+export async function Offline(
+	callback: (context: BaseAudioContext) => Promise<void> | void,
+	duration = 0.1, channels = 1,
+) {
+	const buffer = await PlotOffline(async context => {
+		const originalContext = getContext();
+		setContext(context);
+		await callback(context);
+		setContext(originalContext);
+	}, duration, channels);
+	return buffer;
+}

test/helper/PassAudio.ts

@@ -0,0 +1,24 @@
+import { expect } from "chai";
+import { ToneAudioNode } from "../../Tone/node/AudioNode";
+import { Signal } from "../../Tone/signal/Signal";
+import { Offline } from "../helper/Offline";
+
+/**
+ * Make sure that the audio passes from input node
+ * to the destination node
+ */
+export function PassAudio(
+	callback: (input: ToneAudioNode) => void,
+): Promise<void> {
+	const duration = 0.2;
+	return Offline(() => {
+		const sig = new Signal(0);
+		callback(sig);
+		sig.setValueAtTime(1, duration / 2);
+	}, 0.2, 1).then(buffer => {
+		expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.001);
+		expect(buffer.getValueAtTime(duration / 2 - 0.01)).to.be.closeTo(0, 0.001);
+		expect(buffer.getValueAtTime(duration / 2 + 0.01)).to.not.equal(0);
+		expect(buffer.getValueAtTime(duration - 0.01)).to.not.equal(0);
+	});
+}

test/helper/Supports.ts

@@ -0,0 +1,41 @@
+
+import * as UserAgentParser from "ua-parser-js";
+
+const parsed = new UserAgentParser().getBrowser();
+
+const name = parsed.name as string;
+
+const version = parseInt(parsed.major as string);
+
+function is(browser, above?) {
+	above = above || 0;
+	return name.includes(browser) && version >= above;
+}
+
+function isnt(browser, below?) {
+	below = below || Infinity;
+	return !(name.includes(browser) && version <= below);
+}
+
+function isntVersion(browser, browserVersion?) {
+	return name.includes(browser) && version !== browserVersion;
+}
+
+// can disconnect from a specific node
+export const NODE_DISCONNECT = is("Chrome", 50);
+
+// offline rendering matches Chrome closely
+// chrome is the platform the files were rendered on
+// so it is the default for continuity testing
+export const CHROME_AUDIO_RENDERING = is("Chrome");
+
+// firefox does not correctly handle the situation where
+// a linear/exponential ramp is scheduled after setTargetValueAtTime
+export const SCHEDULE_RAMP_AFTER_SET_TARGET = is("Chrome");
+
+// if the tests run in focus
+export const ONLINE_TESTING = isntVersion("Chrome", 71);
+// the close method resolves a promise
+export const AUDIO_CONTEXT_CLOSE_RESOLVES = isnt("Firefox") && isnt("Safari", 10);
+// if it supports gUM testing
+export const GET_USER_MEDIA = isnt("Safari");

test/node/AudioNode.ts

@@ -0,0 +1,177 @@
+import { expect } from "chai";
+import { ToneAudioNode } from "../../Tone/node/AudioNode";
+import { isDisposed } from "../helper/Dispose";
+
+describe("ToneAudioNode", () => {
+
+	// context("constructor", () => {
+	// 	it("can be created and disposed", () => {
+	// 		const node = new ToneAudioNode();
+	// 		node.dispose();
+	// 		isDisposed(node);
+	// 	});
+	// });
+
+	// context("properties", () => {
+
+	// 	it("handles input and output connections", () => {
+	// 		const node = new ToneAudioNode({
+	// 			numberOfInputs : 1,
+	// 			numberOfOutputs: 2,
+	// 		});
+	// 		expect(node.numberOfInputs).to.equal(1);
+	// 		expect(node.numberOfOutputs).to.equal(2);
+	// 		node.dispose();
+	// 	});
+
+	// 	it("reports its inputs and outputs", () => {
+	// 		const node0 = new ToneAudioNode({
+	// 			numberOfInputs : 3,
+	// 			numberOfOutputs : 2,
+	// 		});
+	// 		expect(node0.numberOfInputs).to.equal(3);
+	// 		expect(node0.numberOfOutputs).to.equal(2);
+	// 		node0.dispose();
+
+	// 		const node1 = new ToneAudioNode({
+	// 			numberOfInputs : 0,
+	// 			numberOfOutputs : 1,
+	// 		});
+	// 		expect(node1.numberOfInputs).to.equal(0);
+	// 		expect(node1.numberOfOutputs).to.equal(1);
+	// 		node1.dispose();
+
+	// 		const node2 = new ToneAudioNode({
+	// 			numberOfInputs : 1,
+	// 			numberOfOutputs : 0,
+	// 		});
+	// 		expect(node2.numberOfInputs).to.equal(1);
+	// 		expect(node2.numberOfOutputs).to.equal(0);
+	// 		node2.dispose();
+	// 	});
+
+		// it("is able to get and set the channelCount, channelCountMode and channelInterpretation", () => {
+		// 	const node0 = new ToneAudioNode({
+		// 		channelCount : 4,
+		// 		numberOfInputs: 1,
+		// 		numberOfOutputs: 1,
+		// 	});
+		// 	expect(node0.channelCount).to.equal(4);
+		// 	node0.channelCount = 1;
+		// 	expect(node0.channelCount).to.equal(1);
+		// 	node0.dispose();
+
+		// 	const node1 = new ToneAudioNode({
+		// 		numberOfInputs : 1,
+		// 		numberOfOutputs : 2,
+		// 	});
+		// 	expect(node1.channelCountMode).to.equal("max");
+		// 	node1.channelCountMode = "explicit";
+		// 	expect(node1.channelCountMode).to.equal("explicit");
+		// 	node1.dispose();
+
+		// 	const node2 = new ToneAudioNode({
+		// 		channelInterpretation : "speakers",
+		// 		numberOfInputs : 2,
+		// 		numberOfOutputs : 0,
+		// 	});
+		// 	expect(node2.channelInterpretation).to.equal("speakers");
+		// 	node2.channelInterpretation = "discrete";
+		// 	expect(node2.channelInterpretation).to.equal("discrete");
+		// 	node2.dispose();
+		// });
+	// });
+
+	// context("connections", () => {
+	// 	it("can connect with args",  () => {
+	// 		const nodeA = new ToneAudioNode({
+	// 			numberOfOutputs : 1,
+	// 		});
+	// 		const nodeB = new ToneAudioNode({
+	// 			numberOfInputs: 1,
+	// 		});
+	// 		nodeA.connect(nodeB, 0, 0);
+	// 		nodeA.dispose();
+	// 		nodeB.dispose();
+	// 	});
+
+	// 	it("can connect with no args", () => {
+	// 		const nodeA = new ToneAudioNode({
+	// 			numberOfOutputs: 1,
+	// 		});
+	// 		const nodeB = new ToneAudioNode({
+	// 			numberOfInputs: 1,
+	// 		});
+	// 		nodeA.connect(nodeB);
+	// 		nodeA.dispose();
+	// 		nodeB.dispose();
+	// 	});
+
+	// 	it("can connect with one arg", () => {
+	// 		const nodeA = new ToneAudioNode({
+	// 			numberOfOutputs: 2,
+	// 		});
+	// 		const nodeB = new ToneAudioNode({
+	// 			numberOfInputs: 1,
+	// 		});
+	// 		nodeA.connect(nodeB, 1);
+	// 		nodeA.dispose();
+	// 		nodeB.dispose();
+	// 	});
+
+	// 	it("Tone nodes can disconnect from everything with no args",  () => {
+	// 		const nodeA = new ToneAudioNode({
+	// 			numberOfOutputs: 1,
+	// 		});
+	// 		const nodeB = new ToneAudioNode({
+	// 			numberOfInputs: 1,
+	// 		});
+	// 		nodeA.connect(nodeB);
+	// 		nodeA.disconnect();
+	// 		nodeA.dispose();
+	// 		nodeB.dispose();
+	// 	});
+
+	// 	it("Tone nodes can disconnect from a specific node", () => {
+	// 		const nodeA = new ToneAudioNode({
+	// 			numberOfOutputs: 1,
+	// 		});
+	// 		const nodeB = new ToneAudioNode({
+	// 			numberOfInputs: 1,
+	// 		});
+	// 		nodeA.connect(nodeB);
+	// 		nodeA.disconnect(nodeB);
+	// 		nodeA.dispose();
+	// 		nodeB.dispose();
+	// 	});
+
+	// 	it("Tone nodes can disconnect from a specific node and input/output", () => {
+	// 		const nodeA = new ToneAudioNode({
+	// 			numberOfOutputs: 2,
+	// 		});
+	// 		const nodeB = new ToneAudioNode({
+	// 			numberOfInputs: 2,
+	// 		});
+	// 		nodeA.connect(nodeB, 1, 1);
+	// 		nodeA.disconnect(nodeB, 1, 1);
+	// 		nodeA.dispose();
+	// 		nodeB.dispose();
+	// 	});
+
+	// 	it("throws an error if they are not connected", () => {
+	// 		// const nodeA = new ToneAudioNode({
+	// 		// 	numberOfOutputs: 2,
+	// 		// });
+	// 		// const nodeB = new ToneAudioNode({
+	// 		// 	numberOfInputs: 2,
+	// 		// });
+	// 		// nodeA.connect(nodeB, 1, 1);
+	// 		// expect(() => {
+	// 		// 	nodeA.disconnect(nodeB, 10, 0);
+	// 		// }).throws(Error);
+	// 		// nodeA.dispose();
+	// 		// nodeB.dispose();
+	// 	});
+	// });
+
+});

test/node/Delay.ts

@@ -0,0 +1,94 @@
+// import Test from "helper/Test";
+import { PassesAudio } from "@tonejs/plot";
+import { expect } from "chai";
+import { connect } from "Tone/core/Connect";
+import { Delay } from "../../Tone/node/Delay";
+import { BasicTests } from "../helper/Basic";
+import { connectFrom, connectTo } from "../helper/Connect";
+
+describe("Delay", () => {
+
+	BasicTests(Delay);
+
+	it("can be created and disposed", () => {
+		const delay = new Delay();
+		delay.dispose();
+	});
+
+	it("handles input and output connections", () => {
+		const delay = new Delay();
+		delay.connect(connectTo());
+		connectFrom().connect(delay);
+		connectFrom().connect(delay.delayTime);
+		delay.dispose();
+	});
+
+	it("can be constructed with an options object", () => {
+		const delay = new Delay({
+			delayTime: 0.3,
+			maxDelay: 2,
+		});
+		expect(delay.delayTime.value).to.be.closeTo(0.3, 0.001);
+		expect(delay.maxDelay).to.equal(2);
+		delay.dispose();
+	});
+
+	it("if the constructor delay time is greater than maxDelay, use that as the maxDelay time", () => {
+		const delay = new Delay(3);
+		expect(delay.delayTime.value).to.be.closeTo(3, 0.001);
+		delay.dispose();
+	});
+
+	it("can set the delayTime value", () => {
+		const delay = new Delay();
+		expect(delay.delayTime.value).to.be.closeTo(0, 0.001);
+		delay.delayTime.value = 0.2;
+		expect(delay.delayTime.value).to.be.closeTo(0.2, 0.001);
+		delay.dispose();
+	});
+
+	it("can be constructed with options object", () => {
+		const delay = new Delay({
+			delayTime: 0.4,
+		});
+		expect(delay.delayTime.value).to.be.closeTo(0.4, 0.001);
+		delay.dispose();
+	});
+
+	it("can be constructed with an initial value", () => {
+		const delay = new Delay(0.3);
+		expect(delay.delayTime.value).to.be.closeTo(0.3, 0.001);
+		delay.dispose();
+	});
+
+	it("can set the units", () => {
+		const delay = new Delay(0);
+		expect(delay.delayTime.value).to.be.closeTo(0, 0.001);
+		delay.dispose();
+	});
+
+	it("can get the value using 'get'", () => {
+		const delay = new Delay(2);
+		const value = delay.get();
+		expect(value.delayTime).to.be.closeTo(2, 0.001);
+		delay.dispose();
+	});
+
+	it("can set the value using 'set'", () => {
+		const delay = new Delay(5);
+		delay.set({
+			delayTime: 4,
+		});
+		expect(delay.delayTime.value).to.be.closeTo(4, 0.001);
+		delay.dispose();
+	});
+
+	it("passes audio through", async () => {
+		expect(await PassesAudio((context, input, output) => {
+			const delay = new Delay({
+				context,
+			}).connect(output);
+			connect(input, delay);
+		})).to.equal(true);
+	});
+});

test/node/Gain.ts

@@ -0,0 +1,75 @@
+import { expect } from "chai";
+import { Gain } from "../../Tone/node/Gain";
+import { BasicTests } from "../helper/Basic";
+import { connectFrom, connectTo } from "../helper/Connect";
+import { PassAudio } from "../helper/PassAudio";
+
+describe("Gain", () => {
+
+	BasicTests(Gain);
+
+	it("can be created and disposed", () => {
+		const gainNode = new Gain();
+		gainNode.dispose();
+	});
+
+	it("handles input and output connections", () => {
+		const gainNode = new Gain();
+		gainNode.connect(connectTo());
+		connectFrom().connect(gainNode);
+		connectFrom().connect(gainNode.gain);
+		gainNode.dispose();
+	});
+
+	it("can set the gain value", () => {
+		const gainNode = new Gain();
+		expect(gainNode.gain.value).to.be.closeTo(1, 0.001);
+		gainNode.gain.value = 0.2;
+		expect(gainNode.gain.value).to.be.closeTo(0.2, 0.001);
+		gainNode.dispose();
+	});
+
+	it("can be constructed with options object", () => {
+		const gainNode = new Gain({
+			gain : 0.4,
+		});
+		expect(gainNode.gain.value).to.be.closeTo(0.4, 0.001);
+		gainNode.dispose();
+	});
+
+	it("can be constructed with an initial value", () => {
+		const gainNode = new Gain(3);
+		expect(gainNode.gain.value).to.be.closeTo(3, 0.001);
+		gainNode.dispose();
+	});
+
+	it("can set the units", () => {
+		const gainNode = new Gain(0, "decibels");
+		expect(gainNode.gain.value).to.be.closeTo(0, 0.001);
+		expect(gainNode.gain.units).to.equal("decibels");
+		gainNode.dispose();
+	});
+
+	it("can get the value using 'get'", () => {
+		const gainNode = new Gain(5);
+		const value = gainNode.get();
+		expect(value.gain).to.be.closeTo(5, 0.001);
+		gainNode.dispose();
+	});
+
+	it("can set the value using 'set'", () => {
+		const gainNode = new Gain(5);
+		gainNode.set({
+			gain: 4,
+		});
+		expect(gainNode.gain.value).to.be.closeTo(4, 0.001);
+		gainNode.dispose();
+	});
+
+	it("passes audio through", () => {
+		return PassAudio((input) => {
+			const gainNode = new Gain().toMaster();
+			input.connect(gainNode);
+		});
+	});
+});

test/node/Param.ts

@@ -0,0 +1,435 @@
+import { Compare, Offline, Plot } from "@tonejs/plot";
+import { expect } from "chai";
+import { getContext } from "../../Tone/core/Global";
+import { Param } from "../../Tone/node/Param";
+import { BasicTests, testAudioContext } from "../helper/Basic";
+import { SCHEDULE_RAMP_AFTER_SET_TARGET } from "../helper/Supports";
+
+const audioContext = getContext();
+
+describe("Param", () => {
+
+	BasicTests(Param, {
+		param: testAudioContext.createOscillator().frequency,
+	});
+
+	context("constructor", () => {
+		it("can be created and disposed", async () => {
+			await Offline(context => {
+				const param = new Param<"time">({
+					context,
+					param: context.createConstantSource().offset,
+					units: "time",
+				});
+				expect(param.getValueAtTime(0)).to.equal(1);
+				param.dispose();
+			});
+		});
+
+		it("can pass in a value", async () => {
+			await Offline(context => {
+				const param = new Param({
+					context,
+					param: context.createConstantSource().offset,
+					value : 1.1,
+				});
+				expect(param.getValueAtTime(0)).to.equal(1.1);
+				param.dispose();
+			});
+		});
+
+		it ("requires a param in the constructor", () => {
+			expect(() => {
+				const param = new Param({
+					value: 1.1,
+				});
+			}).throws(Error);
+		});
+	});
+
+	context("Scheduling Curves", () => {
+
+		const sampleRate = 11025;
+		function matchesOutputCurve(param, outBuffer): void {
+			outBuffer.toArray()[0].forEach((sample, index) => {
+				try {
+					expect(param.getValueAtTime(index / sampleRate)).to.be.closeTo(sample, 0.1);
+				} catch (e) {
+					console.log(index / sampleRate);
+					throw e;
+				}
+			});
+		}
+
+		if (SCHEDULE_RAMP_AFTER_SET_TARGET) {
+
+			it("correctly handles setTargetAtTime followed by a ramp", async () => {
+				let param;
+				// this fails on FF
+				const testBuffer = await Offline(context => {
+					const source = context.createConstantSource();
+					source.connect(context.destination);
+					source.start(0);
+					param = new Param({
+						context,
+						param: source.offset,
+					});
+					param.setTargetAtTime(2, 0.5, 0.1);
+					expect(param.getValueAtTime(0.6)).to.be.closeTo(1.6, 0.1);
+					param.linearRampToValueAtTime(0.5, 0.7);
+					expect(param.getValueAtTime(0.6)).to.be.closeTo(0.75, 0.1);
+				}, 1.5, 1, sampleRate);
+				document.body.appendChild(await Plot.signal(testBuffer));
+				matchesOutputCurve(param, testBuffer);
+			});
+
+			it("schedules a value curve", async () => {
+				let param;
+				const testBuffer = await Offline(context => {
+					const source = context.createConstantSource();
+					source.connect(context.destination);
+					source.start(0);
+					param = new Param({
+						context,
+						param: source.offset,
+						units: "number",
+						value : 0,
+					});
+					param.setValueCurveAtTime([0, 0.5, 0, 1, 1.5], 0.1, 0.8, 0.5);
+					expect(param.getValueAtTime(0.91)).to.be.closeTo(0.75, 0.01);
+				}, 1, 1, sampleRate);
+				document.body.appendChild(await Plot.signal(testBuffer));
+				matchesOutputCurve(param, testBuffer);
+			});
+
+			it ("a mixture of scheduling curves", async () => {
+				let param;
+				const testBuffer = await Offline(context => {
+					const source = context.createConstantSource();
+					source.connect(context.destination);
+					source.start(0);
+					param = new Param({
+						context,
+						param: source.offset,
+						value : 0.1,
+					});
+					param.setValueAtTime(0, 0);
+					param.setValueAtTime(1, 0.1);
+					param.linearRampToValueAtTime(3, 0.2);
+					param.exponentialRampToValueAtTime(0.01, 0.3);
+					param.setTargetAtTime(-1, 0.35, 0.2);
+					param.cancelAndHoldAtTime(0.6);
+					param.rampTo(1.1, 0.2, 0.7);
+					param.exponentialRampTo(0, 0.1, 0.85);
+					param.setValueAtTime(0, 1);
+					param.linearRampTo(1, 0.2, 1);
+					param.targetRampTo(0, 0.1, 1.1);
+					param.setValueAtTime(4, 1.2);
+					param.cancelScheduledValues(1.2);
+					param.linearRampToValueAtTime(1, 1.3);
+				}, 1.5, 1, sampleRate);
+				document.body.appendChild(await Plot.signal(testBuffer));
+				matchesOutputCurve(param, testBuffer);
+			});
+
+			it("can cancel and hold", async () => {
+				let param;
+				const testBuffer = await Offline(context => {
+					const source = context.createConstantSource();
+					source.connect(context.destination);
+					source.start(0);
+					param = new Param({
+						context,
+						param: source.offset,
+						value: 0.1,
+					});
+					param.setValueAtTime(0, 0);
+					param.setValueAtTime(1, 0.2);
+					param.cancelAndHoldAtTime(0.1);
+					param.linearRampToValueAtTime(1, 0.3);
+					param.cancelAndHoldAtTime(0.2);
+					expect(param.getValueAtTime(0.2)).to.be.closeTo(0.5, 0.001);
+					param.exponentialRampToValueAtTime(0, 0.4);
+					param.cancelAndHoldAtTime(0.25);
+					expect(param.getValueAtTime(0.25)).to.be.closeTo(0.033, 0.001);
+					param.setTargetAtTime(1, 0.3, 0.1);
+					param.cancelAndHoldAtTime(0.4);
+					expect(param.getValueAtTime(0.4)).to.be.closeTo(0.644, 0.001);
+					param.setValueAtTime(0, 0.45);
+					param.setValueAtTime(1, 0.48);
+					param.cancelAndHoldAtTime(0.45);
+					expect(param.getValueAtTime(0.45)).to.be.closeTo(0, 0.001);
+				}, 0.5, 1, sampleRate);
+				matchesOutputCurve(param, testBuffer);
+				// document.body.appendChild(await Plot.signal(testBuffer));
+			});
+
+			it ("matches known values", async () => {
+				await Compare.toFile(context => {
+					const source = context.createConstantSource();
+					source.connect(context.destination);
+					source.start(0);
+					const param = new Param({
+						context,
+						param: source.offset,
+						value: 0.1,
+					});
+					param.setValueAtTime(0, 0);
+					param.setValueAtTime(1, 0.2);
+					param.cancelAndHoldAtTime(0.1);
+					param.linearRampToValueAtTime(1, 0.3);
+					param.cancelAndHoldAtTime(0.2);
+					param.exponentialRampToValueAtTime(0, 0.4);
+					param.cancelAndHoldAtTime(0.25);
+					param.setTargetAtTime(1, 0.3, 0.1);
+					param.cancelAndHoldAtTime(0.4);
+				}, "/base/test/audio/param/curve_0.wav", 0.01, 0.5, 1, 11025);
+			});
+		}
+
+	});
+
+	context("Units", () => {
+
+		it("can be created with specific units", () => {
+			const gain = audioContext.createGain();
+			const param = new Param<"bpm">({
+				context: audioContext,
+				param : gain.gain,
+				units : "bpm",
+			});
+			expect(param.units).to.equal("bpm");
+			param.dispose();
+		});
+
+		it("can evaluate the given units", () => {
+			const gain = audioContext.createGain();
+			const param = new Param<"decibels">({
+				context: audioContext,
+				param: gain.gain,
+				units: "decibels",
+			});
+			param.value = 0.5;
+			expect(param.value).to.be.closeTo(0.5, 0.001);
+			param.dispose();
+		});
+
+		it("can be forced to not convert", async () => {
+			const testBuffer = await Offline(context => {
+				const source = context.createConstantSource();
+				source.connect(context.destination);
+				source.start(0);
+				const param = new Param({
+					context,
+					convert : false,
+					param: source.offset,
+					units : "decibels",
+				});
+				param.value = -10;
+				expect(param.value).to.be.closeTo(-10, 0.01);
+			}, 0.001, 1);
+			expect(testBuffer.getValueAtTime(0)).to.be.closeTo(-10, 0.01);
+		});
+
+	});
+
+	context("Unit Conversions", () => {
+		function testUnitConversion(units: Unit, inputValue: any, inputVerification: number, outputValue: number): void {
+			it(`converts to ${units}`, async () => {
+				const testBuffer = await Offline(context => {
+					const source = context.createConstantSource();
+					source.connect(context.destination);
+					source.start(0);
+					const param = new Param({
+						context,
+						param: source.offset,
+						units,
+					});
+					param.value = inputValue;
+					expect(param.value).to.be.closeTo(inputVerification, 0.01);
+				}, 0.001, 1);
+				expect(testBuffer.getValueAtTime(0)).to.be.closeTo(outputValue, 0.01);
+			});
+		}
+
+		testUnitConversion("number", 3, 3, 3);
+		testUnitConversion("decibels", -10, -10, 0.31);
+		testUnitConversion("decibels", -20, -20, 0.1);
+		testUnitConversion("decibels", -100, -100, 0);
+		testUnitConversion("gain", 1.2, 1.2, 1.2);
+		testUnitConversion("positive", 1.5, 1.5, 1.5);
+		testUnitConversion("positive", -1.5, 0, 0);
+		testUnitConversion("time", 2, 2, 2);
+		testUnitConversion("time", 0, 0, 0);
+		testUnitConversion("frequency", 20, 20, 20);
+		testUnitConversion("frequency", 0.1, 0.1, 0.1);
+		testUnitConversion("normalRange", -1, 0, 0);
+		testUnitConversion("normalRange", 0.5, 0.5, 0.5);
+		testUnitConversion("normalRange", 1.5, 1, 1);
+		testUnitConversion("audioRange", -1.1, -1, -1);
+		testUnitConversion("audioRange", 0.5, 0.5, 0.5);
+		testUnitConversion("audioRange", 1.5, 1, 1);
+	});
+
+	context("min/maxValue", () => {
+		function testMinMaxValue(units: Unit, min, max): void {
+			it(`has proper min/max for ${units}`, () => {
+				const source = audioContext.createConstantSource();
+				source.connect(audioContext.destination);
+				const param = new Param({
+					context : audioContext,
+					param: source.offset,
+					units,
+				});
+				expect(param.minValue).to.be.equal(min);
+				expect(param.maxValue).to.be.equal(max);
+			});
+		}
+		// number, decibels, normalRange, audioRange, gain
+		// positive, time, frequency, transportTime, ticks, bpm, degrees, samples, hertz
+		const rangeMax = 3.4028234663852886e+38;
+		testMinMaxValue("number", -rangeMax, rangeMax);
+		testMinMaxValue("decibels", -Infinity, rangeMax);
+		testMinMaxValue("normalRange", 0, 1);
+		testMinMaxValue("audioRange", -1, 1);
+		testMinMaxValue("gain", -rangeMax, rangeMax);
+		testMinMaxValue("positive", 0, rangeMax);
+		testMinMaxValue("time", 0, rangeMax);
+		testMinMaxValue("frequency", 0, rangeMax);
+		testMinMaxValue("transportTime", 0, rangeMax);
+		testMinMaxValue("ticks", 0, rangeMax);
+		testMinMaxValue("bpm", 0, rangeMax);
+		testMinMaxValue("degrees", -rangeMax, rangeMax);
+		testMinMaxValue("samples", 0, rangeMax);
+		testMinMaxValue("hertz", 0, rangeMax);
+	});
+
+	// const allSchedulingMethods = ['setValueAtTime', 'linearRampToValueAtTime', 'exponentialRampToValueAtTime']
+
+	context("setValueAtTime", () => {
+		function testSetValueAtTime(units: Unit, value0, value1, value2): void {
+			it(`can schedule value with units ${units}`, async () => {
+				const testBuffer = await Offline(context => {
+					const source = context.createConstantSource();
+					source.connect(context.destination);
+					source.start(0);
+					const param = new Param({
+						context,
+						param: source.offset,
+						units,
+					});
+					param.setValueAtTime(value0, 0);
+					param.setValueAtTime(value1, 0.01);
+					param.setValueAtTime(value2, 0.02);
+
+					expect(param.getValueAtTime(0)).to.be.closeTo(value0, 0.01);
+					expect(param.getValueAtTime(0.01)).to.be.closeTo(value1, 0.01);
+					expect(param.getValueAtTime(0.02)).to.be.closeTo(value2, 0.01);
+				}, 0.022, 1);
+				expect(testBuffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
+				expect(testBuffer.getValueAtTime(0.011)).to.be.closeTo(1, 0.01);
+				expect(testBuffer.getValueAtTime(0.021)).to.be.closeTo(0.5, 0.01);
+			});
+
+		}
+
+		const allUnits: Unit[] = ["number", "decibels", "normalRange", "audioRange", "gain",
+		"positive", "time", "frequency", "transportTime", "ticks", "bpm", "degrees", "samples", "hertz"];
+
+		allUnits.forEach(unit => {
+			if (unit === "decibels") {
+				testSetValueAtTime(unit, -100, 0, -6);
+			} else {
+				testSetValueAtTime(unit, 0, 1, 0.5);
+			}
+		});
+	});
+
+	["linearRampToValueAtTime", "exponentialRampToValueAtTime"].forEach(method => {
+
+		context(method, () => {
+			function testRampToValueAtTime(units: Unit, value0, value1, value2): void {
+				it(`can schedule value with units ${units}`, async () => {
+					const testBuffer = await Offline(context => {
+						const source = context.createConstantSource();
+						source.connect(context.destination);
+						source.start(0);
+						const param = new Param({
+							context,
+							param: source.offset,
+							units,
+						});
+						param.setValueAtTime(value0, 0);
+						param[method](value1, 0.01);
+						param[method](value2, 0.02);
+
+						expect(param.getValueAtTime(0)).to.be.closeTo(value0, 0.01);
+						expect(param.getValueAtTime(0.01)).to.be.closeTo(value1, 0.01);
+						expect(param.getValueAtTime(0.02)).to.be.closeTo(value2, 0.01);
+					}, 0.022, 1);
+					expect(testBuffer.getValueAtTime(0)).to.be.closeTo(1, 0.01);
+					expect(testBuffer.getValueAtTime(0.01)).to.be.closeTo(0.7, 0.01);
+					expect(testBuffer.getValueAtTime(0.02)).to.be.closeTo(0, 0.01);
+				});
+
+			}
+
+			const allUnits: Unit[] = ["number", "decibels", "normalRange", "audioRange", "gain",
+				"positive", "time", "frequency", "transportTime", "ticks", "bpm", "degrees", "samples", "hertz"];
+
+			allUnits.forEach(unit => {
+				if (unit === "decibels") {
+					testRampToValueAtTime(unit, 0, -3, -100);
+				} else {
+					testRampToValueAtTime(unit, 1, 0.7, 0);
+				}
+			});
+		});
+	});
+
+	["linearRampTo", "exponentialRampTo", "rampTo", "targetRampTo"].forEach(method => {
+
+		context(method, () => {
+			function testRampToValueAtTime(units: Unit, value0, value1, value2): void {
+				it(`can schedule value with units ${units}`, async () => {
+					const testBuffer = await Offline(context => {
+						const source = context.createConstantSource();
+						source.connect(context.destination);
+						source.start(0);
+						const param = new Param({
+							context,
+							param: source.offset,
+							units,
+							value: value0,
+						});
+						param[method](value1, 0.009, 0);
+						param[method](value2, 0.01, 0.01);
+
+						expect(param.getValueAtTime(0)).to.be.closeTo(value0, 0.02);
+						expect(param.getValueAtTime(0.01)).to.be.closeTo(value1, 0.02);
+						if (units !== "decibels") {
+							expect(param.getValueAtTime(0.025)).to.be.closeTo(value2, 0.01);
+						}
+					}, 0.021, 1);
+					// document.body.appendChild(await Plot.signal(testBuffer));
+					expect(testBuffer.getValueAtTime(0)).to.be.closeTo(1, 0.01);
+					expect(testBuffer.getValueAtTime(0.01)).to.be.closeTo(0.7, 0.01);
+					expect(testBuffer.getValueAtTime(0.02)).to.be.closeTo(0, 0.01);
+				});
+
+			}
+
+			const allUnits: Unit[] = ["number", "decibels", "normalRange", "audioRange", "gain",
+				"positive", "time", "frequency", "transportTime", "ticks", "bpm", "degrees", "samples", "hertz"];
+
+			allUnits.forEach(unit => {
+				if (unit === "decibels") {
+					testRampToValueAtTime(unit, 0, -3, -100);
+				} else {
+					testRampToValueAtTime(unit, 1, 0.7, 0);
+				}
+			});
+		});
+	});
+});
+

test/signal/Signal.ts

@@ -0,0 +1,454 @@
+import { expect } from "chai";
+import { Gain } from "../../Tone/node/Gain";
+import { Signal } from "../../Tone/signal/Signal";
+import { BasicTests } from "../helper/Basic";
+import { connectFrom, connectTo } from "../helper/Connect";
+import { ConstantOutput } from "../helper/ConstantOutput";
+import { Offline } from "../helper/Offline";
+
+describe("Signal", () => {
+
+	BasicTests(Signal);
+
+	context("Signal Rate Value", () => {
+
+		it("handles input and output connections", () => {
+			const signal = new Signal();
+			connectFrom().connect(signal);
+			signal.connect(connectTo());
+			signal.dispose();
+		});
+
+		it("can be created with an options object", () => {
+			const signal = new Signal({
+				units: "positive",
+				value: 0.2,
+			});
+			expect(signal.value).to.be.closeTo(0.2, 0.001);
+			expect(signal.units).to.equal("positive");
+			signal.dispose();
+		});
+
+		it("can start with a value initially", () => {
+			const signal = new Signal(2);
+			expect(signal.value).to.equal(2);
+			signal.dispose();
+		});
+
+		it("can set a value", () => {
+			const signal = new Signal(0);
+			signal.value = 10;
+			expect(signal.value).to.equal(10);
+			signal.dispose();
+		});
+
+		it("outputs a constant signal", () => {
+			return ConstantOutput((context) => {
+				const sig = new Signal(2.5).toMaster();
+			}, 2.5);
+		});
+
+		it("takes on another signal's value when connected", () => {
+			return ConstantOutput((context) => {
+				const sigA = new Signal(1).toMaster();
+				const sigB = new Signal(3);
+				sigB.connect(sigA);
+			}, 3);
+		});
+
+		it("takes the first signals value when many values are chained", () => {
+			return ConstantOutput((context) => {
+				const sigA = new Signal(3).toMaster();
+				const sigB = new Signal(1).connect(sigA);
+				const sigC = new Signal(2).connect(sigB);
+			}, 2);
+		});
+	});
+
+	context("Scheduling", () => {
+
+		it("can be scheduled to set a value in the future", async () => {
+			const buffer = await Offline((context) => {
+					const sig = new Signal(0).toMaster();
+					sig.setValueAtTime(2, 0.2);
+			}, 0.25);
+			expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.001);
+			expect(buffer.getValueAtTime(0.19)).to.be.closeTo(0, 0.001);
+			expect(buffer.getValueAtTime(0.2)).to.be.closeTo(2, 0.001);
+			expect(buffer.getValueAtTime(0.24)).to.be.closeTo(2, 0.001);
+		});
+
+		it("can linear ramp from the current value to another value in the future", async () => {
+			const buffer = await Offline(context => {
+				const sig = new Signal(0).toMaster();
+				sig.setValueAtTime(0, 0);
+				sig.linearRampToValueAtTime(1, 0.1);
+			}, 0.1);
+			expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.001);
+			expect(buffer.getValueAtTime(0.05)).to.be.closeTo(0.5, 0.001);
+			expect(buffer.getValueAtTime(0.1)).to.be.closeTo(1, 0.001);
+		});
+
+		it("can schedule multiple automations", async () => {
+			const buffer = await Offline(context => {
+				const sig = new Signal(0).toMaster();
+				sig.setValueAtTime(0, 0);
+				sig.linearRampToValueAtTime(0.5, 0.5);
+				sig.linearRampToValueAtTime(0, 1);
+			}, 1);
+			expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.001);
+			expect(buffer.getValueAtTime(0.25)).to.be.closeTo(0.25, 0.001);
+			expect(buffer.getValueAtTime(0.5)).to.be.closeTo(0.5, 0.001);
+			expect(buffer.getValueAtTime(0.75)).to.be.closeTo(0.25, 0.001);
+			expect(buffer.getValueAtTime(1)).to.be.closeTo(0, 0.001);
+		});
+
+		it("can schedule multiple automations from a connected signal", async () => {
+			const buffer = await Offline((context) => {
+				const output = new Signal(1).toMaster();
+				const sig = new Signal(0).connect(output);
+				sig.setValueAtTime(0, 0);
+				sig.linearRampToValueAtTime(0.5, 0.5);
+				sig.linearRampToValueAtTime(0, 1);
+			}, 1);
+			expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.001);
+			expect(buffer.getValueAtTime(0.25)).to.be.closeTo(0.25, 0.001);
+			expect(buffer.getValueAtTime(0.5)).to.be.closeTo(0.5, 0.001);
+			expect(buffer.getValueAtTime(0.75)).to.be.closeTo(0.25, 0.001);
+			expect(buffer.getValueAtTime(1)).to.be.closeTo(0, 0.001);
+		});
+
+		it("can disconnect from all the connected notes", () => {
+			return ConstantOutput((context) => {
+				const output0 = new Signal(1).toMaster();
+				const output1 = new Signal(1).toMaster();
+				const sig = new Signal(0).connect(output0);
+				sig.connect(output1);
+				sig.disconnect();
+				sig.setValueAtTime(0, 0);
+				sig.linearRampToValueAtTime(0.5, 0.5);
+				sig.linearRampToValueAtTime(0, 1);
+			}, 0);
+		});
+
+		it("can disconnect from a specific node", () => {
+			return ConstantOutput((context) => {
+				const output = new Signal(1).toMaster();
+				const sig = new Signal(0).connect(output);
+				sig.disconnect(output);
+				sig.setValueAtTime(0, 0);
+				sig.linearRampToValueAtTime(0.5, 0.5);
+				sig.linearRampToValueAtTime(0, 1);
+			}, 0);
+		});
+		it("can schedule multiple automations from a connected signal through a multiple nodes", async () => {
+			const buffer = await Offline(() => {
+				const output = new Signal(0).toMaster();
+				const proxy = new Signal(0).connect(output);
+				const gain = new Gain(1).connect(proxy);
+				const sig = new Signal(0).connect(gain);
+				sig.setValueAtTime(0, 0);
+				sig.linearRampToValueAtTime(0.5, 0.5);
+				sig.linearRampToValueAtTime(0, 1);
+			}, 1);
+			expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
+			expect(buffer.getValueAtTime(0.1)).to.be.closeTo(0.1, 0.01);
+			expect(buffer.getValueAtTime(0.25)).to.be.closeTo(0.25, 0.01);
+			expect(buffer.getValueAtTime(0.5)).to.be.closeTo(0.5, 0.01);
+			expect(buffer.getValueAtTime(0.75)).to.be.closeTo(0.25, 0.01);
+			expect(buffer.getValueAtTime(1)).to.be.closeTo(0, 0.01);
+		});
+
+		it("can cancel an automation", () => {
+			return ConstantOutput(() => {
+				const sig = new Signal(1).toMaster();
+				sig.setValueAtTime(4, 0.1);
+				sig.exponentialRampToValueAtTime(3, 0.2);
+				sig.cancelScheduledValues(0);
+			}, 1);
+		});
+		it("can cancel and hold a linear automation curve", async () => {
+			const buffer = await  Offline(() => {
+				const sig = new Signal(0).toMaster();
+				sig.linearRampTo(2, 1);
+				sig.cancelAndHoldAtTime(0.5);
+			}, 1);
+			expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.1);
+			expect(buffer.getValueAtTime(0.25)).to.be.closeTo(0.5, 0.1);
+			expect(buffer.getValueAtTime(0.5)).to.be.closeTo(1, 0.1);
+			expect(buffer.getValueAtTime(0.75)).to.be.closeTo(1, 0.1);
+		});
+
+		it("can cancel and hold an exponential automation curve", () => {
+			return Offline(() => {
+				const sig = new Signal(1).toMaster();
+				sig.exponentialRampTo(2, 1);
+				sig.cancelAndHoldAtTime(0.5);
+			}, 1).then(buffer => {
+				expect(buffer.getValueAtTime(0)).to.be.closeTo(1, 0.1);
+				expect(buffer.getValueAtTime(0.25)).to.be.closeTo(1.2, 0.1);
+				expect(buffer.getValueAtTime(0.5)).to.be.closeTo(1.4, 0.1);
+				expect(buffer.getValueAtTime(0.75)).to.be.closeTo(1.4, 0.1);
+			});
+		});
+
+		it("can set a linear ramp from the current time", () => {
+			return Offline(() => {
+				const sig = new Signal(0).toMaster();
+				sig.linearRampTo(2, 0.3);
+			}, 0.5).then((buffer) => {
+				buffer.forEach((sample, time) => {
+					if (time > 0.3) {
+						expect(sample).to.be.closeTo(2, 0.02);
+					}
+				});
+			});
+		});
+
+		it("can set an linear ramp in the future", () => {
+			return Offline(() => {
+				const sig = new Signal(1).toMaster();
+				sig.linearRampTo(50, 0.3, 0.2);
+			}, 0.7).then((buffer) => {
+				buffer.forEach((sample, time)  => {
+					if (time >= 0.6) {
+						expect(sample).to.be.closeTo(50, 0.5);
+					} else if (time < 0.2) {
+						expect(sample).to.closeTo(1, 0.01);
+					}
+				});
+			});
+		});
+
+		it("can set a exponential approach ramp from the current time", () => {
+			return Offline(() => {
+				const sig = new Signal(0).toMaster();
+				sig.targetRampTo(1, 0.3);
+			}, 0.5).then((buffer) => {
+				expect(buffer.getValueAtTime(0)).to.be.below(0.0001);
+				expect(buffer.getValueAtTime(0.3)).to.be.closeTo(1, 0.02);
+			});
+		});
+
+		it("can set an exponential approach ramp in the future", () => {
+			return Offline(() => {
+				const sig = new Signal(1).toMaster();
+				sig.targetRampTo(50, 0.3, 0.2);
+			}, 0.7).then((buffer) => {
+				expect(buffer.getValueAtTime(0)).to.be.closeTo(1, 0.0001);
+				expect(buffer.getValueAtTime(0.2)).to.be.closeTo(1, 0.0001);
+				expect(buffer.getValueAtTime(0.6)).to.be.closeTo(50, 0.5);
+			});
+		});
+		it("can set an exponential ramp from the current time", () => {
+			return Offline(() => {
+				const sig = new Signal(1).toMaster();
+				sig.exponentialRampTo(50, 0.4);
+			}, 0.6).then((buffer) => {
+				buffer.forEach((sample, time)  => {
+					if (time >= 0.4) {
+						expect(sample).to.be.closeTo(50, 0.5);
+					} else if (time < 0.39) {
+						expect(sample).to.be.lessThan(50);
+					}
+				});
+			});
+		});
+
+		it("can set an exponential ramp in the future", () => {
+			return Offline(() => {
+				const sig = new Signal(1).toMaster();
+				sig.exponentialRampTo(50, 0.3, 0.2);
+			}, 0.8).then((buffer) => {
+				buffer.forEach((sample, time)  => {
+					if (time >= 0.6) {
+						expect(sample).to.be.closeTo(50, 0.5);
+					} else if (time < 0.2) {
+						expect(sample).to.equal(1);
+					}
+				});
+			});
+		});
+
+		it("rampTo ramps from the current value", () => {
+			return Offline(() => {
+				const sig = new Signal(3).toMaster();
+				sig.rampTo(0.2, 0.1);
+			}, 0.4).then((buffer) => {
+				buffer.forEach((sample, time)  => {
+					if (time >= 0.1) {
+						expect(sample).to.be.closeTo(0.2, 0.1);
+					} else {
+						expect(sample).to.be.greaterThan(0.2);
+					}
+				});
+			});
+		});
+
+		it("rampTo ramps from the current value at a specific time", () => {
+			return Offline(() => {
+				const sig = new Signal(0).toMaster();
+				sig.rampTo(2, 0.1, 0.4);
+			}, 0.6).then((buffer) => {
+				buffer.forEach((sample, time)  => {
+					if (time < 0.4) {
+						expect(sample).to.be.closeTo(0, 0.1);
+					} else if (time > 0.5) {
+						expect(sample).to.be.closeTo(2, 0.1);
+					}
+				});
+			});
+		});
+
+		it("can set a value curve", () => {
+			return Offline(() => {
+				const sig = new Signal(0).toMaster();
+				sig.setValueCurveAtTime([0, 1, 0.5, 0.2], 0, 1);
+			}, 1).then((buffer) => {
+				expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
+				expect(buffer.getValueAtTime(0.33 / 2)).to.be.closeTo(0.5, 0.01);
+				expect(buffer.getValueAtTime(0.33)).to.be.closeTo(1, 0.02);
+				expect(buffer.getValueAtTime(0.66)).to.be.closeTo(0.5, 0.02);
+				expect(buffer.getValueAtTime(0.99)).to.be.closeTo(0.2, 0.02);
+			});
+		});
+
+		it("can set a value curve in the future", () => {
+			return Offline(() => {
+				const sig = new Signal(0).toMaster();
+				sig.setValueCurveAtTime([0, 1, 0.5, 0.2], 0.5, 1);
+			}, 1.5).then((buffer) => {
+				expect(buffer.getValueAtTime(0 + 0.5)).to.be.closeTo(0, 0.01);
+				expect(buffer.getValueAtTime(0.33 / 2 + 0.5)).to.be.closeTo(0.5, 0.01);
+				expect(buffer.getValueAtTime(0.33 + 0.5)).to.be.closeTo(1, 0.02);
+				expect(buffer.getValueAtTime(0.66 + 0.5)).to.be.closeTo(0.5, 0.02);
+				expect(buffer.getValueAtTime(0.99 + 0.5)).to.be.closeTo(0.2, 0.02);
+			});
+		});
+
+		it("can set an exponential approach", () => {
+			return Offline(() => {
+				const sig = new Signal(0).toMaster();
+				sig.exponentialApproachValueAtTime(2, 0.1, 0.5);
+			}, 1).then((buffer) => {
+				expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
+				expect(buffer.getValueAtTime(0.1)).to.be.closeTo(0, 0.01);
+				expect(buffer.getValueAtTime(0.4)).to.be.closeTo(1.9, 0.1);
+				expect(buffer.getValueAtTime(0.6)).to.be.closeTo(2, 0.01);
+			});
+		});
+	});
+
+	context("Units", () => {
+
+		it("can be created with specific units", () => {
+			const signal = new Signal(0, "bpm");
+			expect(signal.units).to.equal("bpm");
+			signal.dispose();
+		});
+
+		it("can evaluate the given units", () => {
+			const signal = new Signal(2, "time");
+			signal.value = 0.5;
+			expect(signal.value).to.be.closeTo(0.5, 0.001);
+			signal.dispose();
+		});
+
+		it("converts the given units when passed in the constructor", () => {
+			return ConstantOutput(() => {
+				const signal = new Signal({
+					units: "decibels",
+					value: -10,
+				}).toMaster();
+			}, 0.315);
+		});
+
+		it("can be set to not convert the given units", () => {
+			return ConstantOutput(() => {
+				const signal = new Signal({
+					convert: false,
+					units: "decibels",
+					value: -10,
+				}).toMaster();
+			}, -10);
+		});
+
+		it("converts Frequency units", () => {
+			const signal = new Signal<"frequency">("50hz", "frequency");
+			expect(signal.value).to.be.closeTo(50, 0.01);
+			signal.dispose();
+		});
+
+		it("converts Time units", () => {
+			const signal = new Signal<"time">("4n", "time");
+			expect(signal.value).to.be.closeTo(0.5, 0.01);
+			signal.dispose();
+		});
+
+		it("converts NormalRange units", () => {
+			const signal = new Signal(2, "normalRange");
+			expect(signal.value).to.be.closeTo(1, 0.01);
+			signal.dispose();
+		});
+
+		it("converts AudioRange units", () => {
+			const signal = new Signal(-2, "audioRange");
+			expect(signal.value).to.be.closeTo(-1, 0.01);
+			signal.dispose();
+		});
+
+		it("converts Positive units", () => {
+			const signal = new Signal(-2, "positive");
+			expect(signal.value).to.be.closeTo(0, 0.01);
+			signal.dispose();
+		});
+
+	});
+
+	// context("Transport Syncing", () => {
+
+	// 	it("maintains its original value after being synced to the transport", () => {
+	// 		return ConstantOutput(function(Transport) {
+	// 			const sig = new Signal(3).toMaster();
+	// 			Transport.syncSignal(sig);
+	// 		}, 3);
+	// 	});
+
+	// 	it("keeps the ratio when the bpm changes", () => {
+	// 		return ConstantOutput(function(Transport) {
+	// 			Transport.bpm.value = 120;
+	// 			const sig = new Signal(5).toMaster();
+	// 			Transport.syncSignal(sig);
+	// 			Transport.bpm.value = 240;
+	// 		}, 10);
+	// 	});
+
+	// 	it("can ramp along with the bpm", () => {
+	// 		return Offline(function(Transport) {
+	// 			Transport.bpm.value = 120;
+	// 			const sig = new Signal(2).toMaster();
+	// 			Transport.syncSignal(sig);
+	// 			Transport.bpm.rampTo(240, 0.5);
+	// 		}).then((buffer) => {
+	// 			buffer.forEach((sample, time)  => {
+	// 				if (time >= 0.5) {
+	// 					expect(sample).to.be.closeTo(4, 0.04);
+	// 				} else if (time < 0.4) {
+	// 					expect(sample).to.be.within(1.95, 3);
+	// 				}
+	// 			});
+	// 		});
+	// 	});
+
+	// 	it("returns to the original value when unsynced", () => {
+	// 		return ConstantOutput(function(Transport) {
+	// 			Transport.bpm.value = 120;
+	// 			const sig = new Signal(5).toMaster();
+	// 			Transport.syncSignal(sig);
+	// 			Transport.bpm.value = 240;
+	// 			Transport.unsyncSignal(sig);
+	// 		}, 5);
+	// 	});
+	// });
+
+});

tsconfig.json

@@ -0,0 +1,25 @@
+{
+	"compileOnSave": true,
+	"compilerOptions": {
+		"strictNullChecks": true,
+		"target": "es5",
+		"module": "commonjs",
+		"noImplicitAny": false,
+		"noUnusedLocals": false,
+		"removeComments": false,
+		"experimentalDecorators": true,
+		// "outFile": "./build/Tone.js",
+		"outDir": "./build",
+		"sourceMap": true,
+		"moduleResolution": "classic",
+		"strictPropertyInitialization" : true,
+		"lib": ["es6", "dom"],
+		"baseUrl": "./",
+		"paths" : {
+			"@tonejs/plot" : ["./node_modules/@tonejs/plot/dist/index.d.ts"]
+		}
+	},
+	"include": [
+		"Tone/**/*.ts", "test/**/*.ts"
+	]
+}

tslint.json

@@ -0,0 +1,73 @@
+{
+	"extends": "tslint:recommended",
+	"rulesDirectory": [
+	],
+	"rules": {
+		
+		"new-parens": true,
+		"no-arg": true,
+		"no-bitwise": true,
+		"no-conditional-assignment": true,
+		"no-consecutive-blank-lines": true,
+		"object-literal-sort-keys" : true,
+		"member-access" : false,
+		"member-ordering" : false,
+		"interface-name": false,
+		"arrow-parens" : false,
+		"typedef" : [
+			true,
+			"call-signature"
+		],
+		"one-line": [
+			true,
+			"check-catch",
+			"check-finally",
+			"check-else",
+			"check-whitespace"
+		],
+		"variable-name": [
+			true,
+			"allow-leading-underscore"
+		],
+		"quotemark": [
+			true,
+			"double",
+			"avoid-escape"
+		],
+		"indent": [
+			true,
+			"tabs"
+		],
+		"whitespace": [
+			true,
+			"check-decl",
+			"check-operator",
+			"check-module",
+			"check-separator",
+			"check-rest-spreak",
+			"check-type",
+			"check-typecast",
+			"check-type-operator",
+			"check-branch",
+			"check-operator",
+			"check-typecast"
+		],
+		"no-console": {
+			"severity": "warning",
+			"options": [
+				"debug",
+				"info",
+				"log",
+				"time",
+				"timeEnd",
+				"trace"
+			]
+		}
+	},
+	"jsRules": {
+		"indent": [
+			true,
+			"tabs"
+		]
+	}
+}