+ Gtk::ComboBoxText _model_selector;
+ Gtk::ComboBoxText _custom_device_mode_selector;
+
+ Gtk::CheckMenuItem* _step_edit_item;
+ Gtk::CheckMenuItem* _midi_thru_item;
+ Gtk::Menu* default_channel_menu;
+
+ nframes64_t step_edit_insert_position;
+ Evoral::MusicalTime step_edit_beat_pos;
+ boost::shared_ptr<ARDOUR::Region> step_edit_region;
+ MidiRegionView* step_edit_region_view;
+
+ Gtk::Menu* build_def_channel_menu();
+ void set_default_channel (int);
+ void toggle_midi_thru ();