anchor.diff:      // Create media player
       SoundTrack soundTrack = new SoundTrack();
       soundTrack._player = new MediaPlayerProxy.unbound();
  -    _mediaService.ptr.createPlayer(soundTrack._player);
  -
  -    await soundTrack._player.ptr.prepare(await pipe);
  +    _mediaService.createPlayer(soundTrack._player);
  +
  +    await soundTrack._player.prepare(await pipe);
       return soundTrack;
     }
   
  
positive.code: 
    /// Loads a sound effect.
    Future<SoundEffect> load(MojoDataPipeConsumer data) async {
      SoundPoolLoadResponseParams result = await _soundPool.ptr.load(data);
      if (result.success)
        return new SoundEffect(result.soundId);
  
  
negative.code:   double _leftVolume;
    set leftVolume(double value) {
      _leftVolume = value;
      _soundPool.setVolume(_streamId, <double>[_leftVolume, _rightVolume]);
    }
  
    /// Right volume of the sound effect, valid values are 0.0 to 1.0.
  