diff --git a/gtk2_ardour/trigger_master.cc b/gtk2_ardour/trigger_master.cc
index 2e9b0646fb..da2d440844 100644
--- a/gtk2_ardour/trigger_master.cc
+++ b/gtk2_ardour/trigger_master.cc
@@ -114,73 +114,6 @@ Loopster::render (ArdourCanvas::Rect const& area, Cairo::RefPtr<Cairo::Context>
 	context->set_identity_matrix ();
 }
 
-class PassThru : public ArdourCanvas::Rectangle
-{
-public:
-	PassThru (ArdourCanvas::Item* canvas);
-
-	void render (ArdourCanvas::Rect const& area, Cairo::RefPtr<Cairo::Context> context) const;
-	void set_enabled (bool e);
-
-private:
-	bool _enabled;
-};
-
-PassThru::PassThru (Item* parent)
-	: ArdourCanvas::Rectangle (parent)
-	, _enabled (false)
-{
-}
-
-void
-PassThru::set_enabled (bool e)
-{
-	if (e != _enabled) {
-		_enabled = e;
-		redraw ();
-	}
-}
-
-void
-PassThru::render (ArdourCanvas::Rect const& area, Cairo::RefPtr<Cairo::Context> context) const
-{
-	/* Note that item_to_window() already takes _position into account (as
-	 * part of item_to_canvas()
-	 */
-	ArdourCanvas::Rect       self (item_to_window (_rect));
-	ArdourCanvas::Rect const draw = self.intersection (area);
-
-	if (!draw) {
-		return;
-	}
-
-	context->set_identity_matrix ();
-	context->translate (self.x0, self.y0 - 0.5);
-
-	float size = _rect.height ();
-
-	const double scale = UIConfiguration::instance ().get_ui_scale ();
-
-	if (_enabled) {
-		/* outer white circle */
-		set_source_rgba (context, rgba_to_color (1, 1, 1, 1));
-		context->arc (size / 2, size / 2, size / 2 - 3 * scale, 0, 2 * M_PI);
-		context->fill ();
-
-		/* black circle */
-		set_source_rgba (context, rgba_to_color (0, 0, 0, 1));
-		context->arc (size / 2, size / 2, size / 2 - 5 * scale, 0, 2 * M_PI);
-		context->fill ();
-
-		/* inner white circle */
-		set_source_rgba (context, rgba_to_color (1, 1, 1, 1));
-		context->arc (size / 2, size / 2, size / 2 - 7 * scale, 0, 2 * M_PI);
-		context->fill ();
-	}
-
-	context->set_identity_matrix ();
-}
-
 TriggerMaster::TriggerMaster (Item* parent)
 	: ArdourCanvas::Rectangle (parent)
 	, _context_menu (0)
@@ -197,7 +130,6 @@ TriggerMaster::TriggerMaster (Item* parent)
 	name_text->set_ignore_events (false);
 
 	_loopster = new Loopster (this);
-	_passthru = new PassThru (this);
 
 #if 0 /* XXX trigger changes */
 	_triggerbox->PropertyChanged.connect (_trigger_prop_connection, MISSING_INVALIDATOR, boost::bind (&TriggerMaster::prop_change, this, _1), gui_context());
@@ -381,13 +313,6 @@ TriggerMaster::context_menu ()
 	b = BBT_Offset (-1, 0, 0);
 	qitems.push_back (MenuElem (TriggerUI::quantize_length_to_string (b), sigc::bind (sigc::mem_fun (*this, &TriggerMaster::set_all_quantization), b)));
 
-	items.push_back (CheckMenuElem (_("Toggle Monitor Thru"), sigc::mem_fun (*this, &TriggerMaster::toggle_thru)));
-	if (_triggerbox->pass_thru ()) {
-		_ignore_menu_action = true;
-		dynamic_cast<Gtk::CheckMenuItem*> (&items.back ())->set_active (true);
-		_ignore_menu_action = false;
-	}
-
 	items.push_back (MenuElem (_("Set All Follow Actions..."), *follow_menu));
 	items.push_back (MenuElem (_("Set All Launch Styles..."), *launch_menu));
 	items.push_back (MenuElem (_("Set All Quantizations..."), *quant_menu));
@@ -399,16 +324,6 @@ TriggerMaster::context_menu ()
 	_context_menu->popup (1, gtk_get_current_event_time ());
 }
 
-void
-TriggerMaster::toggle_thru ()
-{
-	if (_ignore_menu_action) {
-		return;
-	}
-
-	_triggerbox->set_pass_thru (!_triggerbox->pass_thru ());
-}
-
 void
 TriggerMaster::clear_all_triggers ()
 {
@@ -493,7 +408,6 @@ TriggerMaster::_size_allocate (ArdourCanvas::Rect const& alloc)
 	name_text->clamp_width (twidth);
 
 	_loopster->set (ArdourCanvas::Rect (0, 0, height, height));
-	_passthru->set (ArdourCanvas::Rect (width - height, 0, width, height));
 
 	/* font scale may have changed. uiconfig 'embeds' the ui-scale in the font */
 	name_text->set_font_description (UIConfiguration::instance ().get_NormalFont ());
@@ -506,8 +420,6 @@ TriggerMaster::prop_change (PropertyChange const& change)
 		return;
 	}
 
-	_passthru->set_enabled (_triggerbox->pass_thru ());
-
 	std::string text;
 
 	ARDOUR::TriggerPtr trigger = _triggerbox->currently_playing ();
diff --git a/gtk2_ardour/trigger_master.h b/gtk2_ardour/trigger_master.h
index 58710be766..d5b69e9fcd 100644
--- a/gtk2_ardour/trigger_master.h
+++ b/gtk2_ardour/trigger_master.h
@@ -47,8 +47,6 @@ namespace ArdourCanvas
 	class Polygon;
 }
 
-class PassThru;
-
 class Loopster : public ArdourCanvas::Rectangle
 {
 public:
@@ -75,7 +73,6 @@ public:
 
 	ArdourCanvas::Text*    name_text;
 
-	void toggle_thru ();
 	void maybe_update ();
 	bool event_handler (GdkEvent*);
 	void selection_change ();
@@ -98,7 +95,6 @@ private:
 	boost::shared_ptr<ARDOUR::TriggerBox> _triggerbox;
 
 	Loopster* _loopster;
-	PassThru* _passthru;
 
 	Gtk::ColorSelectionDialog _color_dialog;
 	Gtk::Menu* _context_menu;