anchor.diff:      }
     }
     
  +  double getVolume() {
  +    return double.parse(volumeSlider.value);
  +  }
   }
positive.code:     pausePlay.classes.add("playing");
      
      isPlaying = true;    
      setVolume(double.parse(volumeSlider.value));
    }
    
    void pause() {
  
negative.code:     stream.onEmptied.listen((_) => resetStream());
      stream.onTimeUpdate.listen((_) =>
          progressSlider.value = stream.currentTime.toString());
      
      // Setup keyboard controls.
      window.onKeyPress
        // Be sure we are not on an input element before we do anything.
        .where((KeyboardEvent e) {
          return document.activeElement.tagName != "INPUT";
      })
        .listen((KeyboardEvent e) {
          e.preventDefault();
  
          // Pause/Play
          if(e.keyCode == KeyCode.SPACE) {
            playPause();
          }
  
          // Change volume
          else if(e.keyCode == 44) {
            setVolume(getVolume() - 0.05, true);
          }
          else if(e.keyCode == 46) {
            setVolume(getVolume() + 0.05, true);
          }
  
        });
    }
    
    void playPause() {
  