// Starts the corresponding AudioPlaybacks
 void StartAudioPlayback()
 {
     if (VRTK_SDKManager.instance != null)
     {
         leftPlayback.BeginPlayback(selectedSong, leftAudioSource);
         rightPlayback.BeginPlayback(selectedSong, rightAudioSource);
     }
     else
     {
         AudioPlayback.instance.BeginPlayback(selectedSong);
     }
 }