anchor.diff:      pausePlay.classes.add("playing");
       
       isPlaying = true;    
  -    setVolume(double.parse(volumeSlider.value));
  +    setVolume(getVolume());
     }
     
     void pause() {
  
positive.code:     stream.onEmptied.listen((_) => resetStream());
      stream.onTimeUpdate.listen((_) =>
          progressSlider.value = stream.currentTime.toString());
    }
    
    void playPause() {
  
negative.code:     }
    }
    
    double getVolume() {
      return double.parse(volumeSlider.value);
    }
  }