public void Execute()
 {
     previousMode       = stereo.CurrentMode;
     previousVolume     = stereo.Volume;
     stereo.CurrentMode = Stereo.Mode.DVD;
     stereo.Volume      = Settings.DVDVolume;
 }
 public void Execute()
 {
     previousMode       = stereo.CurrentMode;
     previousVolume     = stereo.Volume;
     stereo.CurrentMode = Stereo.Mode.Off;
 }