define(["Tone/core/Tone", "Tone/signal/Signal", "Tone/signal/Scale"], function(Tone){

	/**
	 * DRY/WET KNOB
	 * 
	 * equal power fading control values:
	 * 	0 = 100% dry  -    0% wet
	 * 	1 =   0% dry  -  100% wet
	 *
	 * @constructor
	 * @param {number} initialDry
	 */		
	Tone.DryWet = function(initialDry){
		Tone.call(this);

		//components
		this.dry = this.context.createGain();
		this.wet = this.context.createGain();
		//control signal
		this.control = new Tone.Signal();
		this.invert = new Tone.Scale(1, 0);
		this.normal = new Tone.Scale(0, 1);

		//connections
		this.dry.connect(this.output);
		this.wet.connect(this.output);
		//wet control
		this.chain(this.control, this.invert, this.wet.gain);
		//dry control
		this.chain(this.control, this.normal, this.dry.gain);

		//setup
		this.dry.gain.value = 0;
		this.wet.gain.value = 0;
		this.setDry(0);
	};

	Tone.extend(Tone.DryWet);

	/**
	 * Set the dry value of the knob 
	 * 
	 * @param {number} val
	 * @param {Tone.Time} rampTime
	 */
	Tone.DryWet.prototype.setDry = function(val, rampTime){
		rampTime = this.defaultArg(rampTime, 0);
		this.control.linearRampToValueAtTime(val*2 - 1, this.toSeconds(rampTime));
	};

	/**
	 * Set the wet value of the knob 
	 * 
	 * @param {number} val
	 * @param {Tone.Time} rampTime
	 */
	Tone.DryWet.prototype.setWet = function(val, rampTime){
		this.setDry(1-val, rampTime);
	};

	return Tone.DryWet;
});