diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index e28ff8e966..a3e3529854 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -916,6 +916,8 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
 
 	/* Controllables */
 
+	boost::shared_ptr<Processor> processor_by_id (PBD::ID) const;
+
 	boost::shared_ptr<PBD::Controllable> controllable_by_id (const PBD::ID&);
 	boost::shared_ptr<PBD::Controllable> controllable_by_descriptor (const PBD::ControllableDescriptor&);
 
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 75547b5348..725d94c3cc 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -4016,6 +4016,21 @@ Session::route_by_id (PBD::ID id)
 	return boost::shared_ptr<Route> ((Route*) 0);
 }
 
+boost::shared_ptr<Processor>
+Session::processor_by_id (PBD::ID id) const
+{
+	boost::shared_ptr<RouteList> r = routes.reader ();
+
+	for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+		boost::shared_ptr<Processor> p = (*i)->Route::processor_by_id (id);
+		if (p) {
+			return p;
+		}
+	}
+
+	return boost::shared_ptr<Processor> ();
+}
+
 boost::shared_ptr<Track>
 Session::track_by_diskstream_id (PBD::ID id)
 {