diff --git a/gtk2_ardour/application_bar.cc b/gtk2_ardour/application_bar.cc
index 717ea977e1..9a13f347c4 100644
--- a/gtk2_ardour/application_bar.cc
+++ b/gtk2_ardour/application_bar.cc
@@ -553,10 +553,6 @@ ApplicationBar::parameter_changed (std::string p)
 		} else {
 			UI::instance()->set_tip (_sync_button, _("External sync is not possible: video pull up/down is set"));
 		}
-	} else if (p == "primary-clock-delta-mode") {
-//		primary_clock->set_display_delta_mode(UIConfiguration::instance().get_primary_clock_delta_mode());
-	} else if (p == "secondary-clock-delta-mode") {
-//		secondary_clock->set_display_delta_mode(UIConfiguration::instance().get_secondary_clock_delta_mode());
 	} else if (p == "show-mini-timeline") {
 		repack_transport_hbox ();
 	} else if (p == "show-dsp-load-info") {
diff --git a/gtk2_ardour/ardour_ui.cc b/gtk2_ardour/ardour_ui.cc
index 6b530d89bc..8345f370eb 100644
--- a/gtk2_ardour/ardour_ui.cc
+++ b/gtk2_ardour/ardour_ui.cc
@@ -2247,29 +2247,6 @@ ARDOUR_UI::save_state_canfail (string name, bool switch_to_it)
 	return 0;
 }
 
-void
-ARDOUR_UI::primary_clock_value_changed ()
-{
-	if (_session) {
-		_session->request_locate (primary_clock->last_when ().samples());
-	}
-}
-
-void
-ARDOUR_UI::big_clock_value_changed ()
-{
-	if (_session) {
-		_session->request_locate (big_clock->last_when ().samples());
-	}
-}
-
-void
-ARDOUR_UI::secondary_clock_value_changed ()
-{
-	if (_session) {
-		_session->request_locate (secondary_clock->last_when ().samples());
-	}
-}
 void
 ARDOUR_UI::save_template_dialog_response (int response, SaveTemplateDialog* d)
 {
diff --git a/gtk2_ardour/ardour_ui.h b/gtk2_ardour/ardour_ui.h
index 79d4f89b07..fbedef3275 100644
--- a/gtk2_ardour/ardour_ui.h
+++ b/gtk2_ardour/ardour_ui.h
@@ -310,11 +310,12 @@ public:
 
 	GUIObjectState* gui_object_state;
 
-	MainClock* primary_clock;
-	MainClock* secondary_clock;
-	void focus_on_clock ();
+	MainClock* primary_clock;    //this clock is the canonical PrimaryClock, whose mode is reflected to all other clocks with PrimaryClock disposition.
+	MainClock* secondary_clock;  //this clock is the canonical SecondaryClock, whose mode is reflected to all other clocks with PrimaryClock disposition
 	AudioClock*   big_clock;
 
+	void focus_on_clock ();
+
 	VideoTimeLine *video_timeline;
 
 	void reset_main_clocks ();
@@ -587,10 +588,6 @@ private:
 	void audition_alert_clicked ();
 	bool error_alert_press (GdkEventButton *);
 
-	void big_clock_value_changed ();
-	void primary_clock_value_changed ();
-	void secondary_clock_value_changed ();
-
 	/* menu bar and associated stuff */
 
 	Gtk::MenuBar* menu_bar;
diff --git a/gtk2_ardour/ardour_ui2.cc b/gtk2_ardour/ardour_ui2.cc
index 924263b167..1d775f6eb6 100644
--- a/gtk2_ardour/ardour_ui2.cc
+++ b/gtk2_ardour/ardour_ui2.cc
@@ -240,12 +240,6 @@ ARDOUR_UI::setup_transport ()
 	ARDOUR_UI::Clock.connect (sigc::bind (sigc::mem_fun (primary_clock, &MainClock::set), false));
 	ARDOUR_UI::Clock.connect (sigc::bind (sigc::mem_fun (secondary_clock, &MainClock::set), false));
 
-	primary_clock->ValueChanged.connect (sigc::mem_fun(*this, &ARDOUR_UI::primary_clock_value_changed));
-	primary_clock->change_display_delta_mode_signal.connect (sigc::mem_fun(UIConfiguration::instance(), &UIConfiguration::set_primary_clock_delta_mode));
-	secondary_clock->ValueChanged.connect (sigc::mem_fun(*this, &ARDOUR_UI::secondary_clock_value_changed));
-	secondary_clock->change_display_delta_mode_signal.connect (sigc::mem_fun(UIConfiguration::instance(), &UIConfiguration::set_secondary_clock_delta_mode));
-	big_clock->ValueChanged.connect (sigc::mem_fun(*this, &ARDOUR_UI::big_clock_value_changed));
-
 	editor_visibility_button.signal_drag_failed().connect (sigc::bind (sigc::ptr_fun (drag_failed), editor));
 	mixer_visibility_button.signal_drag_failed().connect (sigc::bind (sigc::ptr_fun (drag_failed), mixer));
 	prefs_visibility_button.signal_drag_failed().connect (sigc::bind (sigc::ptr_fun (drag_failed), rc_option_editor));
diff --git a/gtk2_ardour/ardour_ui_options.cc b/gtk2_ardour/ardour_ui_options.cc
index 50c2d49d11..e3ede670af 100644
--- a/gtk2_ardour/ardour_ui_options.cc
+++ b/gtk2_ardour/ardour_ui_options.cc
@@ -384,10 +384,6 @@ ARDOUR_UI::parameter_changed (std::string p)
 
 	} else if (p == "show-track-meters") {
 		if (editor) editor->toggle_meter_updating();
-	} else if (p == "primary-clock-delta-mode") {
-		primary_clock->set_display_delta_mode(UIConfiguration::instance().get_primary_clock_delta_mode());
-	} else if (p == "secondary-clock-delta-mode") {
-		secondary_clock->set_display_delta_mode(UIConfiguration::instance().get_secondary_clock_delta_mode());
 	} else if (p == "super-rapid-clock-update") {
 		if (_session) {
 			stop_clocking ();