virtual void add_location_from_playhead_cursor () = 0;
virtual void remove_location_at_playhead_cursor () = 0;
virtual void set_show_measures (bool yn) = 0;
virtual bool show_measures () const = 0;
virtual void remove_tracks () = 0;
virtual void add_location_from_playhead_cursor () = 0;
virtual void remove_location_at_playhead_cursor () = 0;
virtual void set_show_measures (bool yn) = 0;
virtual bool show_measures () const = 0;
virtual void remove_tracks () = 0;