diff --git a/libs/surfaces/mackie/pot.cc b/libs/surfaces/mackie/pot.cc
index 3b8e8b65a5..d21a18f6ae 100644
--- a/libs/surfaces/mackie/pot.cc
+++ b/libs/surfaces/mackie/pot.cc
@@ -81,7 +81,10 @@ Pot::update_message ()
 		msg +=  (lrintf (value * 10.0) + 1) & 0x0f; // 0b00001111
 	}
 
-	return MidiByteArray (3, 0xb0, id(), msg);
+	/* outbound LED message requires 0x20 to be added to the LED's id
+	 */
+
+	return MidiByteArray (3, 0xb0, 0x20 + id(), msg);
 
 }
 	
diff --git a/libs/surfaces/mackie/pot.h b/libs/surfaces/mackie/pot.h
index ccb6eec0f1..5e9ca6e682 100644
--- a/libs/surfaces/mackie/pot.h
+++ b/libs/surfaces/mackie/pot.h
@@ -9,7 +9,7 @@ class Pot : public Control
 {
 public:
 	enum base_id_t {
-		base_id = 0x30,
+		base_id = 0x10,
 	};
 
 	enum Mode {
diff --git a/libs/surfaces/mackie/strip.cc b/libs/surfaces/mackie/strip.cc
index ac20bb49ac..c3df0e4c19 100644
--- a/libs/surfaces/mackie/strip.cc
+++ b/libs/surfaces/mackie/strip.cc
@@ -259,7 +259,7 @@ Strip::notify_route_deleted ()
 void 
 Strip::notify_gain_changed (bool force_update)
 {
-	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("gain changed for strip %1\n", _index));
+	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("gain changed for strip %1, flip mode\n", _index, _surface->mcp().flip_mode()));
 
 	if (_route && _fader) {
 		
@@ -282,11 +282,16 @@ Strip::notify_gain_changed (bool force_update)
 			}
 			
 			pos = gain_to_slider_position (pos);
+
 			if (force_update || pos != _last_fader_position_written) {
 				_surface->write (_fader->set_position (pos));
 				_last_fader_position_written = pos;
+			} else {
+				DEBUG_TRACE (DEBUG::MackieControl, "value is stale, no message sent\n");
 			}
-		} 
+		} else {
+			DEBUG_TRACE (DEBUG::MackieControl, "fader in use, no message sent\n");
+		}
 	}
 }