diff --git a/libs/surfaces/mackie/mcp_buttons.cc b/libs/surfaces/mackie/mcp_buttons.cc
index 6e8ad5f198..4954fda199 100644
--- a/libs/surfaces/mackie/mcp_buttons.cc
+++ b/libs/surfaces/mackie/mcp_buttons.cc
@@ -166,6 +166,19 @@ MackieControlProtocol::cursor_left_press (Button& )
 		} else {
 			ZoomOut (); /* EMIT SIGNAL */
 		}
+	} else {
+		float page_fraction;
+		if (_modifier_state == MODIFIER_CONTROL) {
+			page_fraction = 1.0;
+		} else if (_modifier_state == MODIFIER_OPTION) {
+			page_fraction = 0.1;
+		} else if (_modifier_state == MODIFIER_SHIFT) {
+			page_fraction = 2.0;
+		} else {
+			page_fraction = 0.25;
+		}
+
+		ScrollTimeline (page_fraction);
 	}
 
 	return off;
@@ -187,8 +200,21 @@ MackieControlProtocol::cursor_right_press (Button& )
 		} else {
 			ZoomIn (); /* EMIT SIGNAL */
 		}
-	}
+	} else {
+		float page_fraction;
+		if (_modifier_state == MODIFIER_CONTROL) {
+			page_fraction = 1.0;
+		} else if (_modifier_state == MODIFIER_OPTION) {
+			page_fraction = 0.1;
+		} else if (_modifier_state == MODIFIER_SHIFT) {
+			page_fraction = 2.0;
+		} else {
+			page_fraction = 0.25;
+		}
 
+		ScrollTimeline (page_fraction);
+	}
+			
 	return off;
 }
 
diff --git a/libs/surfaces/mackie/surface.cc b/libs/surfaces/mackie/surface.cc
index 157b781531..6210e37e7b 100644
--- a/libs/surfaces/mackie/surface.cc
+++ b/libs/surfaces/mackie/surface.cc
@@ -388,7 +388,7 @@ Surface::handle_midi_controller_message (MIDI::Parser &, MIDI::EventTwoBytes* ev
 {
 	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("SurfacePort::handle_midi_controller %1 = %2\n", (int) ev->controller_number, (int) ev->value));
 
-	Pot* pot = pots[ev->controller_number];
+	Pot* pot = pots[Pot::base_id + ev->controller_number];
 
 	if (!pot && ev->controller_number == Jog::base_id) {
 		pot = dynamic_cast<Pot*> (controls_by_name["jog"]);
@@ -417,6 +417,7 @@ Surface::handle_midi_controller_message (MIDI::Parser &, MIDI::EventTwoBytes* ev
 		_mcp.add_in_use_timeout (*this, *pot, pot);
 
 		Strip* strip = dynamic_cast<Strip*> (&pot->group());
+
 		if (strip) {
 			strip->handle_pot (*pot, delta);
 		} else {