anchor.diff:        double volume = 1.0,
         double pitch = 1.0,
         double pan = 0.0,
  -      double startTime = 0.0,
         SoundCompleteCallback callback = null]) {
   
       // Create new PlayingSound object
  
positive.code:       sound,
        tag,
        loop,
        startTime,
        volume,
        pitch,
        pan,
  
negative.code:     } else {
        // Reuse player
        playingSound._player = _mediaPlayers[sound];
        playingSound._player.ptr.seekTo(0);
        playingSound._player.ptr.start();
      }
  
  