 
 class RootViewController: UIViewController {
 
-  var audioManager: AudioManager = AudioManager()
+  let audioManager: AudioManager = AudioManager()
   
   override func canBecomeFirstResponder() -> Bool {
     return true

        println("play/pause toggled")
      case .RemoteControlPlay:
        println("play button pressed")
        audioManager.play();
      case .RemoteControlPause:
        println("pause button pressed")
        audioManager.pause();

        break
    }
  }
  
  deinit {
    UIApplication.sharedApplication().endReceivingRemoteControlEvents();
  }
}