message: set the value directly instead of setting _param.value
diff: @@ -43,7 +43,7 @@ define(["Tone/core/Tone", "Tone/signal/Signal", "Tone/core/Gain"], function(Tone
  */
  this._param = this.input[1] = this.output.gain;
  - this._param.value = Tone.defaultArg(value, 0);
  + this.value = Tone.defaultArg(value, 0);
  };
  Tone.extend(Tone.Multiply, Tone.Signal);
  