diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 004ba33..c4801b7 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -48,6 +48,7 @@
 #include "ardour/port.h"
 #include "ardour/process_thread.h"
 #include "ardour/session.h"
+#include "ardour/debug.h"
 
 #include "i18n.h"
 
@@ -544,12 +545,14 @@ AudioEngine::process_callback (pframes_t nframes)
 	if (_freewheeling && !Freewheel.empty()) {
 		/* emit the Freewheel signal and stop freewheeling in the event of trouble
 		 */
+		DEBUG_TRACE (DEBUG::Transport, string_compose ("Freewheel PROCESS @%1 ; +%2 frames\n", _session->_transport_frame, nframes));
                 boost::optional<int> r = Freewheel (nframes);
 		if (r.get_value_or (0)) {
 			jack_set_freewheel (_priv_jack, false);
 		}
 
 	} else {
+		DEBUG_TRACE (DEBUG::Transport, string_compose ("Normal PROCESS @%1 ; +%2 frames\n", _session->_transport_frame, nframes));
 		MIDI::Manager::instance()->cycle_start(nframes);
 
 		if (_session) {
diff --git a/libs/ardour/session_export.cc b/libs/ardour/session_export.cc
index acb23ae..362a315 100644
--- a/libs/ardour/session_export.cc
+++ b/libs/ardour/session_export.cc
@@ -31,6 +31,7 @@
 #include "ardour/process_thread.h"
 #include "ardour/session.h"
 #include "ardour/track.h"
+#include "ardour/debug.h"
 
 #include "i18n.h"
 
@@ -145,6 +146,7 @@ Session::start_audio_export (framepos_t position)
 	   since then has re-awakened it.
 	 */
 
+	DEBUG_TRACE (DEBUG::Transport, string_compose ("Export START @%1\n", _transport_frame));
 	set_transport_speed (1.0, false);
 	butler_transport_work ();
 	g_atomic_int_set (&_butler->should_do_transport_work, 0);
@@ -194,6 +196,7 @@ int
 Session::process_export_fw (pframes_t nframes)
 {
         _engine.main_thread()->get_buffers ();
+	DEBUG_TRACE (DEBUG::Transport, string_compose ("Export transport @%1 \n", _transport_frame));
 	process_export (nframes);
         _engine.main_thread()->drop_buffers ();
 	return 0;