+extern sigc::signal<void> RedrawMetrics;
+
+extern sigc::signal<void, int, ARDOUR::RouteGroup*, ARDOUR::MeterType> SetMeterTypeMulti;
+
+gint meter_expose_ticks (GdkEventExpose *ev, ARDOUR::MeterType type, std::vector<ARDOUR::DataType> types, Gtk::DrawingArea *mta);
+gint meter_expose_metrics (GdkEventExpose *ev, ARDOUR::MeterType type, std::vector<ARDOUR::DataType> types, Gtk::DrawingArea *mma);