anchor.diff:  class SoundEffectStream {
     SoundEffectStream(
       this.sound,
  -    this.tag,
       this.loop,
       this.volume,
       this.pitch,
  
positive.code:     return playingSound;
    }
  
    void stop(Object tag) {
      for (int i = _playingSounds.length; i >= 0; i--) {
        SoundEffectStream playingSound = _playingSounds[i];
        if (playingSound.tag == tag) {
          playingSound._player.ptr.pause();
          _playingSounds.removeAt(i);
        }
      }
    }
  
    List<SoundEffectStream> playingSoundsForTag(Object tag) {
      List<SoundEffectStream> list = [];
      for (SoundEffectStream playingSound in _playingSounds) {
        if (playingSound.tag == tag) {
          list.add(playingSound);
        }
      }
      return list;
    }
  
    void stopAll() {
      for (SoundEffectStream playingSound in _playingSounds) {
        playingSound._player.ptr.pause();
      }
      _playingSounds = [];
    }
  }
  
  
negative.code:         playingSound._player.ptr.start();
        });
  
        _soundEffectStreams.add(playingSound);
        _mediaPlayers[sound] = playingSound._player;
      } else {
        // Reuse player
  