StackOverflow2013

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PO
primarykey
Id
16573282
data
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2013-05-15T19:19:19.417
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2017-07-27T09:15:06.630
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2017-07-27T09:15:06.630
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882146
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882146
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6343450
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2
Score
50
ViewCount
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LastEditorDisplayName
text
Body
<p>You can use the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API" rel="noreferrer">Web Audio API</a> in most browsers now (<a href="http://caniuse.com/#feat=audio-api" rel="noreferrer">excepting IE and Opera Mini</a>).</p> <p>Try out this code:</p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>// one context per document var context = new (window.AudioContext || window.webkitAudioContext)(); var osc = context.createOscillator(); // instantiate an oscillator osc.type = 'sine'; // this is the default - also square, sawtooth, triangle osc.frequency.value = 440; // Hz osc.connect(context.destination); // connect it to the destination osc.start(); // start the oscillator osc.stop(context.currentTime + 2); // stop 2 seconds after the current time</code></pre> </div> </div> </p> <p>If you want the volume lower, you can do something like this:</p> <pre><code>var context = new webkitAudioContext(); var osc = context.createOscillator(); var vol = context.createGain(); vol.gain.value = 0.1; // from 0 to 1, 1 full volume, 0 is muted osc.connect(vol); // connect osc to vol vol.connect(context.destination); // connect vol to context destination osc.start(context.currentTime + 3); // start it three seconds from now </code></pre> <p>I got most of this from experimenting in chromium while reading the <a href="http://www.w3.org/TR/webaudio/" rel="noreferrer">Web Audio API Working Draft</a>, which I found from @brainjam 's link.</p> <p>I hope that helps. Lastly, it is very helpful to inspect the various objects in the chrome inspector (ctrl-shift-i).</p>
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