private void NWGUI_KeyDown(object sender, KeyEventArgs e) { if (midiPlayer == null || midiPlayer.IsInPreviewMode) { return; } if (e.Key == Key.Space) { Pause_Clicked(sender, e); } else if (e.Key == Key.M) { midiPlayer.PlayOtherChannels = !midiPlayer.PlayOtherChannels; } }