void new_transport_marker_menu_popdown ();
void marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
void tempo_or_meter_marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
void new_transport_marker_menu_popdown ();
void marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);
void tempo_or_meter_marker_context_menu (GdkEventButton*, ArdourCanvas::Item*);