_midi_controls_box.pack_start (_midnam_model_selector, false, false, 2);
_midi_controls_box.pack_start (_midnam_custom_device_mode_selector, false, false, 2);
_midi_controls_box.pack_start (_midnam_model_selector, false, false, 2);
_midi_controls_box.pack_start (_midnam_custom_device_mode_selector, false, false, 2);