diff --git a/gtk2_ardour/editor_routes.cc b/gtk2_ardour/editor_routes.cc
index fe1e5af62b..69c876ba99 100644
--- a/gtk2_ardour/editor_routes.cc
+++ b/gtk2_ardour/editor_routes.cc
@@ -1894,5 +1894,6 @@ int
 EditorRoutes::plugin_setup (boost::shared_ptr<Route> r, boost::shared_ptr<PluginInsert> pi, ARDOUR::Route::PluginSetupOptions flags)
 {
 	PluginSetupDialog psd (r, pi, flags);
-	return psd.run ();
+	int rv = psd.run ();
+	return rv + (psd.fan_out() ? 4 : 0);
 }
diff --git a/gtk2_ardour/plugin_setup_dialog.cc b/gtk2_ardour/plugin_setup_dialog.cc
index 5feb76aefe..3df0fe6491 100644
--- a/gtk2_ardour/plugin_setup_dialog.cc
+++ b/gtk2_ardour/plugin_setup_dialog.cc
@@ -31,6 +31,7 @@ PluginSetupDialog::PluginSetupDialog (boost::shared_ptr<ARDOUR::Route> r, boost:
 	, _route (r)
 	, _pi (pi)
 	, _keep_mapping (_("Copy I/O Map"), ArdourButton::led_default_elements)
+	, _fan_out (_("Fan out"), ArdourButton::led_default_elements)
 {
 	assert (flags != Route::None);
 
@@ -71,7 +72,7 @@ PluginSetupDialog::PluginSetupDialog (boost::shared_ptr<ARDOUR::Route> r, boost:
 		f->add (*box);
 		tbl->attach (*f, 0, 1, row, row + 1, EXPAND|FILL, SHRINK, 0, 8);
 
-		_keep_mapping.signal_clicked.connect (sigc::mem_fun (*this, &PluginSetupDialog::apply_mapping)); 
+		_keep_mapping.signal_clicked.connect (sigc::mem_fun (*this, &PluginSetupDialog::apply_mapping));
 		add_button ("Replace", 2);
 	} else {
 
@@ -86,16 +87,19 @@ PluginSetupDialog::PluginSetupDialog (boost::shared_ptr<ARDOUR::Route> r, boost:
 		Box* box = manage (new HBox ());
 		box->set_border_width (2);
 		box->pack_start (_out_presets, true, true);
+		box->pack_start (_fan_out, false, false);
 		Frame* f = manage (new Frame ());
 		f->set_label (_("Output Configuration"));
 		f->add (*box);
 		tbl->attach (*f, 1, 2, row, row + 1, EXPAND|FILL, SHRINK, 0, 8);
+		_fan_out.signal_clicked.connect (sigc::mem_fun (*this, &PluginSetupDialog::toggle_fan_out));
 	} else {
 		_pi->set_preset_out (_pi->natural_output_streams ());
 		update_sensitivity (_pi->natural_output_streams ().n_audio ());
 	}
 
 	_keep_mapping.set_active (false);
+	_fan_out.set_active (false);
 	apply_mapping ();
 
 	add_button (Stock::ADD, 0);
@@ -162,6 +166,7 @@ PluginSetupDialog::update_sensitivity (uint32_t n_audio)
 	} else {
 		_keep_mapping.set_sensitive (false);
 	}
+	_fan_out.set_sensitive (n_audio > 2);
 }
 
 bool
@@ -190,6 +195,12 @@ PluginSetupDialog::apply_mapping ()
 	}
 }
 
+void
+PluginSetupDialog::toggle_fan_out ()
+{
+	_fan_out.set_active (!_fan_out.get_active ());
+}
+
 std::string
 PluginSetupDialog::preset_label (uint32_t n_audio) const
 {
diff --git a/gtk2_ardour/plugin_setup_dialog.h b/gtk2_ardour/plugin_setup_dialog.h
index b2fc3e77f2..8d07b62539 100644
--- a/gtk2_ardour/plugin_setup_dialog.h
+++ b/gtk2_ardour/plugin_setup_dialog.h
@@ -30,6 +30,8 @@ class PluginSetupDialog : public ArdourDialog
 public:
 	PluginSetupDialog (boost::shared_ptr<ARDOUR::Route>, boost::shared_ptr<ARDOUR::PluginInsert>, ARDOUR::Route::PluginSetupOptions);
 
+	bool fan_out () const { return _fan_out.get_active () && _fan_out.get_sensitive (); }
+
 private:
 	void setup_output_presets ();
 	void update_sensitivity (uint32_t);
@@ -37,6 +39,7 @@ private:
 
 	void select_output_preset (uint32_t n_audio);
 	void apply_mapping ();
+	void toggle_fan_out ();
 
 	std::string preset_label (uint32_t) const;
 
@@ -45,6 +48,7 @@ private:
 
 	ArdourDropdown _out_presets;
 	ArdourButton _keep_mapping;
+	ArdourButton _fan_out;
 	ARDOUR::ChanCount _cur_inputs;
 	ARDOUR::ChanCount _cur_outputs;
 };
diff --git a/gtk2_ardour/route_ui.cc b/gtk2_ardour/route_ui.cc
index 9c4ddeade8..1ce6114a3e 100644
--- a/gtk2_ardour/route_ui.cc
+++ b/gtk2_ardour/route_ui.cc
@@ -285,6 +285,7 @@ RouteUI::set_route (boost::shared_ptr<Route> rp)
 	_route->solo_safe_control()->Changed.connect (route_connections, invalidator (*this), boost::bind (&RouteUI::update_solo_display, this), gui_context());
 	_route->solo_isolate_control()->Changed.connect (route_connections, invalidator (*this), boost::bind (&RouteUI::update_solo_display, this), gui_context());
 	_route->phase_control()->Changed.connect (route_connections, invalidator (*this), boost::bind (&RouteUI::polarity_changed, this), gui_context());
+	_route->fan_out.connect (route_connections, invalidator (*this), boost::bind (&RouteUI::fan_out, this, true, true), gui_context());
 
 	if (is_track()) {
 		track()->FreezeChange.connect (*this, invalidator (*this), boost::bind (&RouteUI::map_frozen, this), gui_context());