diff --git a/libs/surfaces/mackie/mackie_control_protocol.cc b/libs/surfaces/mackie/mackie_control_protocol.cc
index bf252411fb..c84327f5a7 100644
--- a/libs/surfaces/mackie/mackie_control_protocol.cc
+++ b/libs/surfaces/mackie/mackie_control_protocol.cc
@@ -185,15 +185,10 @@ MackiePort&
 MackieControlProtocol::port_for_id (uint32_t index)
 {
 	uint32_t current_max = 0;
-	
-	cerr << "Looking for port for index " << index << endl;
-	
 
 	for (MackiePorts::iterator it = _ports.begin(); it != _ports.end(); ++it) {
-		cerr << "\tport " << (*it)->input_port().name() << '/' << (*it)->output_port().name() << " has " << (*it)->strips() << endl;
 		current_max += (*it)->strips();
 		if (index < current_max) { 
-			cerr << "\t\tUSE IT\n";
 			return **it;
 		}
 	}
diff --git a/libs/surfaces/mackie/mackie_midi_builder.cc b/libs/surfaces/mackie/mackie_midi_builder.cc
index 293bbebc09..7cafbd2ebb 100644
--- a/libs/surfaces/mackie/mackie_midi_builder.cc
+++ b/libs/surfaces/mackie/mackie_midi_builder.cc
@@ -22,10 +22,14 @@
 #include <iomanip>
 #include <algorithm>
 
+#include "pbd/compose.h"
+
+#include "ardour/debug.h"
 #include "controls.h"
 #include "midi_byte_array.h"
 #include "mackie_port.h"
 
+using namespace PBD;
 using namespace Mackie;
 using namespace std;
 
@@ -191,39 +195,40 @@ MidiByteArray MackieMidiBuilder::strip_display_blank( SurfacePort & port, const
 	return strip_display( port, strip, line_number, "      " );
 }
 
-MidiByteArray MackieMidiBuilder::strip_display( SurfacePort & port, const Strip & strip, unsigned int line_number, const std::string & line )
+MidiByteArray MackieMidiBuilder::strip_display (SurfacePort & port, const Strip & strip, unsigned int line_number, const std::string & line )
 {
 	assert (line_number <= 1);
-	assert (strip.index() < 8);
-
-#ifdef NUCLEUS_DEBUG	
-	cout << "MackieMidiBuilder::strip_display index: " << strip.index() << ", line " << line_number << ": " << line << endl;
-#endif
 
 	MidiByteArray retval;
-	
+	uint32_t index = strip.index() % port.strips();
+
+	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("MackieMidiBuilder::strip_display index: %1, line %2 = %3\n", strip.index(), line_number, line));
+
 	// sysex header
 	retval << port.sysex_hdr();
 	
 	// code for display
 	retval << 0x12;
 	// offset (0 to 0x37 first line, 0x38 to 0x6f for second line )
-	retval << ( strip.index() * 7 + ( line_number * 0x38 ) );
+	retval << (index * 7 + (line_number * 0x38));
 	
 	// ascii data to display
 	retval << line;
 	// pad with " " out to 6 chars
-	for ( int i = line.length(); i < 6; ++i ) retval << ' ';
+	for (int i = line.length(); i < 6; ++i) {
+		retval << ' ';
+	}
 	
 	// column spacer, unless it's the right-hand column
-	if ( strip.index() < 7 ) retval << ' ';
+	if (strip.index() < 7) {
+		retval << ' ';
+	}
 
 	// sysex trailer
 	retval << MIDI::eox;
 	
-#ifdef NUCLEUS_DEBUG	
-	cout << "MackieMidiBuilder::strip_display midi: " << retval << endl;
-#endif
+	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("MackieMidiBuilder::strip_display midi: %1\n", retval));
+
 	return retval;
 }
 	
diff --git a/libs/surfaces/mackie/surface.cc b/libs/surfaces/mackie/surface.cc
index 5b79cac4a6..e9e7723776 100644
--- a/libs/surfaces/mackie/surface.cc
+++ b/libs/surfaces/mackie/surface.cc
@@ -1,3 +1,4 @@
+#include "ardour/debug.h"
 #include "surface.h"
 
 #include <sstream>
@@ -5,6 +6,7 @@
 #include <iostream>
 
 using namespace std;
+using namespace PBD;
 using namespace Mackie;
 
 Surface::Surface( uint32_t max_strips, uint32_t unit_strips )
@@ -14,14 +16,10 @@ Surface::Surface( uint32_t max_strips, uint32_t unit_strips )
 
 void Surface::init()
 {
-#ifdef DEBUG
-	cout << "Surface::init" << endl;
-#endif
+	DEBUG_TRACE (DEBUG::MackieControl, "Surface::init\n");
 	init_controls();
 	init_strips( _max_strips, _unit_strips );
-#ifdef DEBUG
-	cout << "Surface::init finish" << endl;
-#endif
+	DEBUG_TRACE (DEBUG::MackieControl, "Surface::init finish\n");
 }
 
 Surface::~Surface()
@@ -42,12 +40,13 @@ Surface::~Surface()
 // Mackie-specific, because of multiple devices on separate ports
 // add the strips from 9..max_strips
 // unit_strips is the number of strips for additional units.
-void Surface::init_strips( uint32_t max_strips, uint32_t unit_strips )
+void Surface::init_strips (uint32_t max_strips, uint32_t unit_strips)
 {
-	if ( strips.size() < max_strips )
-	{
+	if ( strips.size() < max_strips ) {
+
 		uint32_t const old_size = strips.size();
 		strips.resize (max_strips);
+		
 		for (uint32_t i = old_size; i < max_strips; ++i) {
 			// because I can't find itoa
 			ostringstream os;
@@ -62,8 +61,8 @@ void Surface::init_strips( uint32_t max_strips, uint32_t unit_strips )
 			Strip * strip = new Strip( *strips[i % unit_strips] );
 			
 			// update the relevant values
-			strip->index( i );
-			strip->name( name );
+			strip->index (i);
+			strip->name (name);
 			
 			// add to data structures
 			groups[name] = strip;