private void Settings_Changed(object sender, SettingChangedEventArgs e)
 {
     if(e.ChangedPropertyName == nameof(Settings.Volume)) {
         RaisePropertyChanged(nameof(Volume));
     }
 }
 private void Settings_Changed(object sender, SettingChangedEventArgs e)
 {
     RaisePropertyChanged(e.ChangedPropertyName);
 }