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HTML 

              
                <canvas></canvas>

<a href="http://rileyjshaw.com" target="_blank" class="info">
  <p>Web Audio API</p>
  <p>Experiment #1</p>
  <p>Shepard-Risset Glissando</p>
  <p>✎ rileyjshaw</p>
</a>

<div class="arrows">
  <p class="up">▲</p>
  <p class="down">▲</p>
</div>

<script>
  // relevant resources:
  // http://www.sitepoint.com/using-fourier-transforms-web-audio-api/
  // https://chromium.googlecode.com/svn/trunk/samples/audio/wave-tables/
  
  // "celeste" from chromium repository:
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}
</script>
!

CSS 

              
                $pink: #f48fb1
$teal: #64ffda

body, p, a
  margin: 0
  color: $teal

body
  overflow: hidden
  font-family: 'Open Sans', sans-serif
  font-weight: bold
  background: $pink
  
.arrows, .info, canvas
  position: absolute
  
.arrows
  bottom: 50%
  right: 50%
  font-size: 96px
  color: $teal
  transform: translate(50%, 50%)
  transition: bottom 0.24s, right 0.24s, transform 0.24s
  
  p  
    cursor: pointer
    transition: font-size 0.24s, text-shadow 0.24s
    
    &:hover
      text-shadow: 0 -18px 0px mix($pink, lighten($teal, 12), 18%), 0 -36px 0 mix($pink, lighten($teal, 24), 18%)
    
  .running &
    bottom: 8px
    right: 12px
    font-size: 24px
    transform: translate(0, 0)
    
    p:hover
      text-shadow: 0 -8px 0 mix($pink, lighten($teal, 24), 18%)
  
.down
  transform: rotate(180deg)
  
.info
  bottom: 6px
  left: 6px
  height: 48px
  width: 48px
  box-sizing: border-box
  padding: 6px 12px
  border: 4px solid $teal
  border-radius: 24px
  overflow: hidden
  text-decoration: none
  transition: height 0.24s, width 0.24s
  
  p
    margin-top: 60px
    transition: margin-top 0.24s
  
  &::before
    content: '?'
    position: absolute
    top: 2px
    left: 15px
    font-size: 24px
    font-weight: bold
    transition: left 0.24s 0.24s
  
  &:hover
    height: 108px
    width: 240px
    transition: height 0.24s 0.24s, width 0.24s
  
    p
      margin-top: 0
      transition: margin-top 0.24s 0.24s
    
    &::before
      left: -30px
      transition: left 0.24s

canvas
  top: 0
  left: 0
  right: 0
  bottom: 0
!

JS 

              
                !function () {
  /*  -----  *
   *  AUDIO  *
   *  -----  */

  // Demo variables - play around with these
  const OCTAVES = 5;         // number of concurrent octaves
  const FUNDAMENTAL = 87.31; // fundamental frequency, F2
  let T = 10;                // period of repetition (in seconds)
  let direction = 1;         // 1 = down, -1 = up

  // Web Audio API context
  const AUDIO_CTX = new (window.AudioContext || window.webkitAudioContext)();

  // Our custom wave table (`celeste` is defined in a script tag)
  const REAL = new Float32Array(celeste.real);
  const IMAGINARY = new Float32Array(celeste.imag);
  const WAVE = AUDIO_CTX.createPeriodicWave(REAL, IMAGINARY);

  // AudioParam's exponentialRampToValueAtTime() or setValueCurveAtTime()
  // methods would be really useful for this experiment, but it would be
  // difficult to define a looping behaviour with precision since they
  // don't accept a callback.
  // 
  // It's pretty simple to write our own exponential decay function,
  // so we'll just do that:
  // n_0 = initial value, t = time, t_half = half-life
  const f = (n_0, t, t_half) => n_0 * POW(2, -direction * t / t_half);

  // This gives us a bell curve, which we can use to boost the volume of
  // frequencies in the middle of our range:
  const GAUSSIAN = (x, a, b, c) => a * EXP(-POW(x - b, 2) / 2 * POW(c, 2));

  // Alias parts of the Math library
  const PI2 = Math.PI * 2;
  const POW = Math.pow;
  const ABS = Math.abs;
  const EXP = Math.exp;

  // Another helper function; returns elapsed time in seconds
  const now = () => AUDIO_CTX.currentTime;

  // Derived values
  let f_0;
  T *= OCTAVES;

  // Empty list to hold our oscillators
  let ascenders = new Array(OCTAVES);

  // Makes an oscillator that ascends to the max pitch,
  // then drops down & starts again
  function makeAscender (phase) {
    function step (t) {
      // phase-shift and normalize t
      t = (t + phase) % T;
      
      const FREQUENCY = f(f_0, t, T / OCTAVES);
      const AMPLITUDE = GAUSSIAN(t, 0.5, T / 2, 0.2);
      
      OSCILLATOR.frequency.value = FREQUENCY;
      GAIN_NODE.gain.value = AMPLITUDE;
      circle(t, AMPLITUDE);
    }

    const OSCILLATOR = AUDIO_CTX.createOscillator(); // create sound source
    const GAIN_NODE = AUDIO_CTX.createGain();         // create gain node

    OSCILLATOR.setPeriodicWave(WAVE);
    OSCILLATOR.connect(GAIN_NODE);            // connect sound source to gain node
    GAIN_NODE.connect(AUDIO_CTX.destination); // connect gain node to output
    GAIN_NODE.gain.value = 2 / OCTAVES;
    OSCILLATOR.start(0);

    return { step };
  }

  // main loop
  function glissando () {
    const NOW = now();
    CANVAS_CTX.clearRect(0, 0, width, height);
    ascenders.forEach(a => a.step(NOW));
    setTimeout(glissando, 20);
  }
  
  // Add some pink noise to match the background :)
  function pinkify () {
    const BUFFER_SIZE = 4096;
    const PINK_NOISE = (function() {
      let b0, b1, b2, b3, b4, b5, b6;
      b0 = b1 = b2 = b3 = b4 = b5 = b6 = 0.0;
      const NODE = AUDIO_CTX.createScriptProcessor(BUFFER_SIZE, 1, 1);
      NODE.onaudioprocess = function(e) {
        const OUTPUT = e.outputBuffer.getChannelData(0);
        for (let i = 0; i < BUFFER_SIZE; i++) {
          let white = Math.random() * 2 - 1;
          b0 = 0.99886 * b0 + white * 0.0555179;
          b1 = 0.99332 * b1 + white * 0.0750759;
          b2 = 0.96900 * b2 + white * 0.1538520;
          b3 = 0.86650 * b3 + white * 0.3104856;
          b4 = 0.55000 * b4 + white * 0.5329522;
          b5 = -0.7616 * b5 - white * 0.0168980;
          OUTPUT[i] = b0 + b1 + b2 + b3 + b4 + b5 + b6 + white * 0.5362;
          OUTPUT[i] *= 0.11; // (roughly) compensate for gain
          b6 = white * 0.115926;
        }
      }
      return NODE;
    })();
    let noiseGain = AUDIO_CTX.createGain();
    noiseGain.gain.value = 0.05;
    PINK_NOISE.connect(noiseGain);
    noiseGain.connect(AUDIO_CTX.destination);
  }


  /*  -------  *
   *  DISPLAY  *
   *  -------  */

  let height, width;
  
  const CANVAS = document.querySelector('canvas');
  const CANVAS_CTX = CANVAS.getContext('2d');
  
  // Draw a circle from a passed in time and amplitude
  function circle (t, A) {
    const r = POW(A, 2 / OCTAVES) * 40;
    const x = width / 2;
    // Calculate y as a percentage, based on `direction`
    let y = (1 - direction) / 2 + direction * t / T;
    // Pad by 10% to avoid hitting the canvas edge
    y = y * 0.8 + 0.1;
    // ...and fit it to the canvas's height
    y *= height;
    
    CANVAS_CTX.beginPath();
    CANVAS_CTX.arc(x, y, r, 0, PI2);
    CANVAS_CTX.fill();
    CANVAS_CTX.closePath();
  };

  // Make the canvas fullscreen (called on init and resize)
  function setDimensions () {
    height = window.innerHeight;
    width = document.documentElement.clientWidth;
    
    // reset canvas attributes
    CANVAS.height = height;
    CANVAS.width = width;
    CANVAS_CTX.fillStyle = '#64ffda';
    CANVAS_CTX.font = '24px Ariel';
  }

  // Event listeners
  document.querySelector('.up').addEventListener('click', () => init(-1));
  document.querySelector('.down').addEventListener('click', () => init(1));
	window.addEventListener('resize', setDimensions);
  
  /*  -----------  *
   *  START IT UP  *
   *  -----------  */

  let running = false;
  function init (dir) {
    document.body.focus();
    direction = dir;
    f_0 = FUNDAMENTAL * POW(2, direction * OCTAVES / 2); // starting pitch
    
    if (!running) {
      running = true;
      document.body.className = 'running';
      
      // Populate the `ascenders` array
      for (let i = 0; i < OCTAVES; i++) {
        ascenders.push(makeAscender(T * i / OCTAVES));
      }

      setDimensions();
      pinkify();
      glissando();
    }
  }
}();
!
999px

Console