music thingy

wavepot

function pulse(freq, offset, t) {
  return Math.sin(2 * Math.PI * t * freq)
       + Math.sin(2 * Math.PI * t * (freq + (1* offset)))
       + Math.sin(2 * Math.PI * t * (freq + (2*offset)));
}

function noise() {
  return Math.random();
}

function sqr(freq, t) {
  return Math.sin(2 * Math.PI * t * freq) > 0 ? 1 : -1;
}
function drum(freq, t, n) {
  return sqr(freq, (t + Math.random() * 0.001));
}

function saw(freq, t) {
  return (2 * ((freq * t) - floor(t * freq)) - 1);
}


function dsp(t) {
  var notes = [100, 148, 10, 350, 10, 10, 100, 150, 5, 200, 10, 600, 1, 600, 200, 50];
  var notes2 = [500, 200, 500, 100, 500, 10, 10, 350];
  var cmel = (Math.floor(t*0.25)) % 2 ? notes: notes2;
  var n = cmel[Math.floor(t*8) % cmel.length];
  var d = cmel[(Math.floor(t*4) - 1) % cmel.length];
  return 0.3 * pulse(80, 8, t) * sqr(n, t) * Math.sin(2 * Math.PI * t * 8)
  + (t % .25 < .08 ? drum(d/10, t, 1)  * 1: 0)
  + sqr(d, t) * .6;
}

http://wavepot.com/phmongeau/803783f4e5d13dc8fd14