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dsp.js

var tau = Math.PI * 2;
var dot = 2.0;

var a = [
    [69-4, 69-2, 69, 69, 69-4],
    [   8,    8,  4,  4,    4]
];
var b = [
    [69-4, 69-2, 69, 69, 69, 69, 69+1, 69, 69-2],
    [   8,    8,  8,  8,  8,  8,    4,  4,    4]
];

var seq = sequencer([
  a, a, b, [[0], [1/5.0]]
]);
 
function dsp(t) {
  var afp = seq(t);
  return afp[0] * 0.03 * Math.sin(tau * t * afp[1]);
}
 
function hz(pitch) {
  return Math.pow(2.0, (pitch - 69)/12) * 440.0;
}
 
function sequencer(verses) {
  var verse   = 0;
  var current = 0;
  var struck  = 0;
 
  var n = verses.length;
  return function(t) {
    var duration = verses[verse][1][current % n];
    var pitch    = verses[verse][0][current % n];
    var j        = Math.max(0.0, (t - struck) / (dot/duration));
    if (1.0 <= j) {
      struck  += dot/duration;
      current += 1;
    }
    if (current >= verses[verse][0].length)
    {
      current = 0;
      verse   = (verse + 1) % verses.length;
    }
    
    if (pitch === 0) j = 0;
    return [Math.min(1.0, j), hz(pitch), pitch];
  };
}

doesn't work for me?

Sorry. Something I did seems to have broken it. Added a fix so it runs now, but something's still wrong.