Wavepot (wavepot.com) WIP

wavepot.js

var bpm = 240; // beats per minute
var spb = 60/bpm; // seconds per beat

// gets note `n` frequency of `octave`
function note(n, octave){
  n += 2;
  return Math.pow(2, (n - 33 + (12 * (octave || 0))) / 12) * 440;
}

// random noise
function Noise() {
  return Math.random() * 2 - 1;
}

var noise = Noise();

// simple drums from our random noise function
function drums(a,t) {
  return a * (t % (1) < 1/32 ? noise 0);
}

var melody = [note(0,3), note(7,2), note(11,2), note(2,3), note(3,3), note(7,3), note(2,3), note(3,3)];
var bassline = [note(3,1), note(0,1), note(-1,1), note(0,1), note(0,1), note(2,1), note(0,1), note(0,1)];

function sin(a,t,f) {
  return a * Math.sin(2 * Math.PI * t * f);
}

var counter;

function dsp(t) {
  counter = Math.floor(t/spb); //How many beats have passed
  return sin(0.11, t, melody[counter%8])// * sin(0.2, t, 4)
  +      sin(0.11, t, bassline[counter%8])
  +      drums(0.11, t);
}