void add_note_selection_region_view (RegionView* rv, uint8_t note, uint16_t chn_mask);
void extend_note_selection_region_view (RegionView*, uint8_t note, uint16_t chn_mask);
void toggle_note_selection_region_view (RegionView*, uint8_t note, uint16_t chn_mask);
void add_note_selection_region_view (RegionView* rv, uint8_t note, uint16_t chn_mask);
void extend_note_selection_region_view (RegionView*, uint8_t note, uint16_t chn_mask);
void toggle_note_selection_region_view (RegionView*, uint8_t note, uint16_t chn_mask);