diff --git a/gtk2_ardour/rta_manager.cc b/gtk2_ardour/rta_manager.cc
index e72bacffeb..e9dc3789ee 100644
--- a/gtk2_ardour/rta_manager.cc
+++ b/gtk2_ardour/rta_manager.cc
@@ -195,6 +195,25 @@ RTAManager::remove (std::shared_ptr<ARDOUR::Route> route)
 	}
 }
 
+void
+RTAManager::clear ()
+{
+	std::list<RTA>::iterator i = _rta.begin ();
+	while (i != _rta.end ()) {
+		std::shared_ptr<ARDOUR::Route> route = i->route ();
+		if (route->is_master ()) {
+			++i;
+			continue;
+		}
+		i = _rta.erase (i);
+		route->gui_changed ("rta", this); /* EMIT SIGNAL */
+	}
+
+	if (_rta.empty ()) {
+		SignalReady (); /* EMIT SIGNAL */
+	}
+}
+
 bool
 RTAManager::attached (std::shared_ptr<ARDOUR::Route> route) const
 {
diff --git a/gtk2_ardour/rta_manager.h b/gtk2_ardour/rta_manager.h
index 8ba8abc75d..9082b5b2a9 100644
--- a/gtk2_ardour/rta_manager.h
+++ b/gtk2_ardour/rta_manager.h
@@ -85,6 +85,7 @@ public:
 	void attach (std::shared_ptr<ARDOUR::Route>);
 	void remove (std::shared_ptr<ARDOUR::Route>);
 	bool attached (std::shared_ptr<ARDOUR::Route>) const;
+	void clear ();
 
 	std::list<RTA> const& rta () const
 	{