sine_example.html (Source) 

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<!doctype html>
<html>

<blockquote style="border: 2px solid #122; padding: 10px; background-color: #ccc;">

  <head>
    <title>Sine Example</title>
  </head>

  <body>
    <p>Sine Example.</p>
    <p>
      <button onclick="play()">Play</button>
      <button onclick="stop()">Stop</button>
      <span>
	<input id="pan" type="range" min="10" max="1000" step="1" value="440" oninput="frequency(this.value);">
	Frequency
      </span>
    </p>
  
  </body>

</blockquote>


  <script>
    var audioContext = new window.AudioContext
    var oscillator = audioContext.createOscillator()
    var gainNode = audioContext.createGain()
    
    gainNode.gain.value = 0

    oscillator.connect(gainNode)
    gainNode.connect(audioContext.destination)

    oscillator.start(0)

    function play()
    {
      gainNode.gain.value = 1
    }

    function stop()
    {
      gainNode.gain.value = 0
    }
    
    function frequency(y)
    {
      oscillator.frequency.value = y
    }
    
  
  </script>
</html>

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