<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Signal Ramping</title> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> <link rel="icon" type="image/png" sizes="174x174" href="./favicon.png"> <script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/2.4.3/webcomponents-bundle.js"></script> <link href="https://fonts.googleapis.com/css?family=Material+Icons&display=block" rel="stylesheet"/> <script src="../build/Tone.js"></script> <script src="./js/tone-ui.js"></script> <script src="./js/components.js"></script> </head> <body> <style> tone-slider { width: 100%; margin-top: 10px; } </style> <tone-example label="rampTo"> <div slot="explanation"> Working with signals is different than working with numbers or strings: Signals are values which are updated at audio rate, which allows for sample-accurate scheduling and ramping. <code>.rampTo(value, rampTime)</code> smoothly changes the signal from the current value to the target value over the duration of the rampTime. This example uses <code>.rampTo</code> in to smooth out changes in volume and frequency. </div> <div id="content"> <tone-play-toggle></tone-play-toggle> <tone-slider label="harmonicity" min="0.5" max="2" value="1"></tone-slider> </div> </tone-example> <script type="text/javascript"> const oscillators = []; const bassFreq = 32; for (let i = 0; i < 8; i++) { oscillators.push(new Tone.Oscillator({ frequency: bassFreq * i, type: "sawtooth4", volume: -Infinity, detune: Math.random() * 30 - 15, }).toDestination()); } // bind the interface document.querySelector("tone-play-toggle").addEventListener("start", e => { oscillators.forEach(o => { o.start(); o.volume.rampTo(-20, 1); }); }); document.querySelector("tone-play-toggle").addEventListener("stop", e => { oscillators.forEach(o => { o.stop("+1.2"); o.volume.rampTo(-Infinity, 1); }); }); document.querySelector("tone-slider").addEventListener("input", e => { oscillators.forEach((osc, i) => { osc.frequency.rampTo(bassFreq * i * parseFloat(e.target.value), 0.4); }); }); </script> </body> </html>