message: removing mute
  could set "amplitude" to 0, LFO does not need to match Source API
diff: @@ -261,21 +261,6 @@ Object.defineProperty(Tone.LFO.prototype, "units", {
  }
  });
  -/**
  - * Mute the output.
  - * @memberOf Tone.LFO#
  - * @type {Boolean}
  - * @name mute
  - */
  -Object.defineProperty(Tone.LFO.prototype, "mute", {
  - get : function(){
  - return this._oscillator.mute;
  - },
  - set : function(mute){
  - this._oscillator.mute = mute;
  - }
  -});
  -
  /**
  * Returns the playback state of the source, either "started" or "stopped".
  * @type {Tone.State}
  