message: Remove subtle blip on waveform in analysis example
diff: waveContext.lineJoin = "round";
  waveContext.lineWidth = 6;
  waveContext.strokeStyle = waveformGradient;
  - waveContext.moveTo(0, (values[0] / 255) * canvasHeight);
  + waveContext.moveTo(0, (values[0] + 1) / 2 * canvasHeight);
  for (var i = 1, len = values.length; i < len; i++){
  var val = (values[i] + 1) / 2;
  var x = canvasWidth * (i / len);
  