Better timing

flippinawesome.js

var audio = new window.webkitAudioContext(),
  position = 0,
  scale = {
    g: 392,
    f: 349.23,
    e: 329.63,
    b: 493.88
  },
  song = "gfefgg-fff-gbb-gfefggggffgfe---";

function createOscillator(freq) {
  var osc = audio.createOscillator();
  osc.frequency.value = freq || 0;
  osc.type = "square";
  osc.connect(audio.destination);
  osc.start(0);
  osc.stop(audio.currentTime + (1/4));
  osc.onended = function() {
    osc.disconnect(audio.destination);
    play();
  };
}

function play() {
  var note = song.charAt(position),
    freq = scale[note];
  position += 1;
  if ( position >= song.length ) {
    position = 0;
  }
  createOscillator(freq);
}

play();