message: no need to test if _wave exists
  should always exist
diff: @@ -123,11 +123,7 @@ Tone.Oscillator.prototype._start = function(time){
  this.log("start", time);
  //new oscillator with previous values
  this._oscillator = new Tone.OscillatorNode();
  - if (this._wave){
  this._oscillator.setPeriodicWave(this._wave);
  - } else {
  - this._oscillator.type = this._type;
  - }
  //connect the control signal to the oscillator frequency & detune
  this._oscillator.connect(this.output);
  this.frequency.connect(this._oscillator.frequency);
  