anchor.diff:      if (_players.containsKey(id)) {
         return _players[id];
       } else {
  -      final player = AssetsAudioPlayer._(
  -        id: id,
  -      );
  +      final player = AssetsAudioPlayer._(id: id);
         _players[id] = player;
         return player;
       }
     }
   
     factory AssetsAudioPlayer.newPlayer() => _getOrCreate(id: uuid.v4());
  -
  -  AudioPlayerHandler audioPlayerHandler;
   
     /// empty constructor now create a new player
     factory AssetsAudioPlayer() => AssetsAudioPlayer.newPlayer();
  
positive.code:     if (audio != null) {
        _respectSilentMode = respectSilentMode;
        String path;
        path = await audioPlayerHandler.onPlay(audio);
        try {
          Map<String, dynamic> params = {
            "id": this.id,
  
negative.code: 
    Duration _lastSeek;
  
    Future<String> Function(String) onPlay;
  
    /// returns the looping state : true -> looping, false -> not looping
    bool get loop => _loop.value;
    bool get shuffle => _loop.value;
  