anchor.diff:  
   //=============================================================================
   
  +  static const num DEFAULT_VOLUME = 1;
  +  static const num DEFAULT_PAN = 0;
  +
  +//=============================================================================
  +
     /**
      * Makes a Sound object.
      */
  -  Sound(State context, String soundName,{num volume:1,num pan:0}){
  +  Sound(State context, String soundName,{num volume:DEFAULT_VOLUME,num pan:DEFAULT_PAN}){
       _sound = context.game.resourceManager.getSound(soundName);
       settings = new StageXL.SoundTransform(volume,pan);
     }
  
positive.code: 
    StageXL.Sound _sound;
  
    StageXL.SoundChannel _soundchannel;
  
    /**
     * Setting for Sound(volume, pan).
  
negative.code:    * Play the sound.
     */
    void play(){
      _soundChannel = _sound.play(false, settings);
    }
  
    void stop() {
      _soundChannel.stop();
    }
  
  }