public AudioMixerViewModel()
 {
     Apps = new ObservableCollection<AppItemViewModel>();
     _audioService = new EarTrumpetAudioSessionService();
     _deviceService = new EarTrumpetAudioDeviceService();
     _proxy = new AudioMixerViewModelCallbackProxy(_audioService, _deviceService);
 }
 public AudioMixerViewModelCallbackProxy(EarTrumpetAudioSessionService service, EarTrumpetAudioDeviceService deviceService)
 {
     _service = service;
     _deviceService = deviceService;
 }