diff --git a/gtk2_ardour/export_dialog.cc b/gtk2_ardour/export_dialog.cc
index 8902391b0b..75b0f8c1e9 100644
--- a/gtk2_ardour/export_dialog.cc
+++ b/gtk2_ardour/export_dialog.cc
@@ -916,7 +916,6 @@ ExportDialog::do_export ()
 void
 ExportDialog::end_dialog ()
 {
-
 	if (spec.running) {
 		spec.stop = true;
 
@@ -929,7 +928,7 @@ ExportDialog::end_dialog ()
 		}
 	}
 
-	session->engine().freewheel (false);
+	session->finalize_audio_export ();
 
 	hide_all ();
 
diff --git a/gtk2_ardour/export_range_markers_dialog.cc b/gtk2_ardour/export_range_markers_dialog.cc
index b6bd25a60d..1184294a67 100644
--- a/gtk2_ardour/export_range_markers_dialog.cc
+++ b/gtk2_ardour/export_range_markers_dialog.cc
@@ -65,7 +65,7 @@ ExportRangeMarkersDialog::process_range_markers_export(Locations::LocationList&
 	Locations::LocationList::iterator locationIter;
 	current_range_marker_index = 0;
 	init_progress_computing(locations);
-	
+
 	for (locationIter = locations.begin(); locationIter != locations.end(); ++locationIter) {
 		Location *currentLocation = (*locationIter);
 
@@ -90,7 +90,8 @@ ExportRangeMarkersDialog::process_range_markers_export(Locations::LocationList&
 
 			// wait until export of this range finished
 			gtk_main_iteration();
-			while(spec.running){
+
+			while (spec.running){
 				if(gtk_events_pending()){
 					gtk_main_iteration();
 				}else {
@@ -197,12 +198,6 @@ ExportRangeMarkersDialog::progress_timeout ()
 {
 	double progress = 0.0;
 
-	cerr << "Progress timeout, total = " << total_duration << " index = " << current_range_marker_index
-	     << " current = " << range_markers_durations[current_range_marker_index]
-	     << " agg = " << range_markers_durations_aggregated[current_range_marker_index]
-	     << " prog = " << spec.progress
-	     << endl;
-	
 	if (current_range_marker_index >= range_markers_durations.size()){
 		progress = 1.0;
 	} else{
diff --git a/libs/ardour/ardour/export.h b/libs/ardour/ardour/export.h
index f66acec893..66e5b1b7d5 100644
--- a/libs/ardour/ardour/export.h
+++ b/libs/ardour/ardour/export.h
@@ -76,9 +76,9 @@ namespace ARDOUR
 
 	    /* shared between UI thread and audio thread */
 
-	    float progress;  /* audio thread sets this */
-	    bool  stop;      /* UI sets this */
-	    bool  running;   /* audio thread sets to false when export is done */
+	    volatile float progress;  /* audio thread sets this */
+	    volatile bool  stop;      /* UI sets this */
+	    volatile bool  running;   /* audio thread sets to false when export is done */
 
 	    int   status;
 
diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index 919d9a8162..5beaee8e33 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -575,7 +575,8 @@ class Session : public PBD::StatefulDestructible
 
 	int start_audio_export (ARDOUR::AudioExportSpecification&);
 	int stop_audio_export (ARDOUR::AudioExportSpecification&);
-	
+	void finalize_audio_export ();
+
 	void add_source (boost::shared_ptr<Source>);
 	void remove_source (boost::weak_ptr<Source>);
 
diff --git a/libs/ardour/audiosource.cc b/libs/ardour/audiosource.cc
index dfe88ace78..0043df7d2e 100644
--- a/libs/ardour/audiosource.cc
+++ b/libs/ardour/audiosource.cc
@@ -671,7 +671,7 @@ AudioSource::compute_and_write_peaks (Sample* buf, nframes_t first_frame, nframe
 	Sample* buf2 = 0;
 	nframes_t to_do;
 	uint32_t  peaks_computed;
-	PeakData* peakbuf;
+	PeakData* peakbuf = 0;
 	int ret = -1;
 	nframes_t current_frame;
 	nframes_t frames_done;
diff --git a/libs/ardour/import.cc b/libs/ardour/import.cc
index b81f438490..712b9a35e4 100644
--- a/libs/ardour/import.cc
+++ b/libs/ardour/import.cc
@@ -117,7 +117,6 @@ Session::import_audiofile (import_status& status)
 	float *data = 0;
 	Sample **channel_data = 0;
 	long nfiles = 0;
-	long n;
 	string basepath;
 	string sounds_dir;
 	nframes_t so_far;
@@ -143,14 +142,14 @@ Session::import_audiofile (import_status& status)
 		importable = new ImportableSource (in, &info);
 	}
 
-	for (n = 0; n < info.channels; ++n) {
+	for (int n = 0; n < info.channels; ++n) {
 		newfiles.push_back (boost::shared_ptr<AudioFileSource>());
 	}
 
 	sounds_dir = discover_best_sound_dir ();
 	basepath = PBD::basename_nosuffix (status.paths.front());
 
-	for (n = 0; n < info.channels; ++n) {
+	for (int n = 0; n < info.channels; ++n) {
 
 		bool goodfile = false;
 
@@ -162,7 +161,7 @@ Session::import_audiofile (import_status& status)
 					snprintf (buf, sizeof(buf), "%s/%s-R.wav", sounds_dir.c_str(), basepath.c_str());
 				}
 			} else if (info.channels > 1) {
-				snprintf (buf, sizeof(buf), "%s/%s-c%lu.wav", sounds_dir.c_str(), basepath.c_str(), n+1);
+				snprintf (buf, sizeof(buf), "%s/%s-c%d.wav", sounds_dir.c_str(), basepath.c_str(), n+1);
 			} else {
 				snprintf (buf, sizeof(buf), "%s/%s.wav", sounds_dir.c_str(), basepath.c_str());
 			}
@@ -199,7 +198,7 @@ Session::import_audiofile (import_status& status)
 	data = new float[nframes * info.channels];
 	channel_data = new Sample * [ info.channels ];
 	
-	for (n = 0; n < info.channels; ++n) {
+	for (int n = 0; n < info.channels; ++n) {
 		channel_data[n] = new Sample[nframes];
 	}
 
@@ -222,7 +221,8 @@ Session::import_audiofile (import_status& status)
 		/* de-interleave */
 				
 		for (chn = 0; chn < info.channels; ++chn) {
-			
+
+			nframes_t n;
 			for (x = chn, n = 0; n < nfread; x += info.channels, ++n) {
 				channel_data[chn][n] = (Sample) data[x];
 			}
@@ -257,7 +257,7 @@ Session::import_audiofile (import_status& status)
 	if (status.multichan) {
 		/* all sources are used in a single multichannel region */
 
-		for (n = 0; n < nfiles && !status.cancel; ++n) {
+		for (int n = 0; n < nfiles && !status.cancel; ++n) {
 			/* flush the final length to the header */
 			newfiles[n]->update_header(0, *now, xnow);
 			sources.push_back(newfiles[n]);
@@ -274,7 +274,7 @@ Session::import_audiofile (import_status& status)
 		status.new_regions.push_back (r);
 
 	} else {
-		for (n = 0; n < nfiles && !status.cancel; ++n) {
+		for (int n = 0; n < nfiles && !status.cancel; ++n) {
 
 			/* flush the final length to the header */
 
@@ -309,7 +309,7 @@ Session::import_audiofile (import_status& status)
 	}
 	
 	if (channel_data) {
-		for (n = 0; n < info.channels; ++n) {
+		for (int n = 0; n < info.channels; ++n) {
 			delete [] channel_data[n];
 		}
 		delete [] channel_data;
diff --git a/libs/ardour/mix.cc b/libs/ardour/mix.cc
index a32c274b7c..2d31c8ccc8 100644
--- a/libs/ardour/mix.cc
+++ b/libs/ardour/mix.cc
@@ -92,7 +92,7 @@ compute_peak (ARDOUR::Sample *buf, nframes_t nsamples, float current)
 void
 find_peaks (ARDOUR::Sample *buf, nframes_t nframes, float *min, float *max)
 {
-	long i;
+	nframes_t i;
 	float a, b;
 
 	a = *max;
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 129fa5f743..b496afe9d6 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -3626,7 +3626,6 @@ Session::next_insert_id ()
 		for (boost::dynamic_bitset<uint32_t>::size_type n = 0; n < insert_bitset.size(); ++n) {
 			if (!insert_bitset[n]) {
 				insert_bitset[n] = true;
-				cerr << "Returning " << n << " as insert ID\n";
 				return n;
 				
 			}
@@ -3647,7 +3646,6 @@ Session::next_send_id ()
 		for (boost::dynamic_bitset<uint32_t>::size_type n = 0; n < send_bitset.size(); ++n) {
 			if (!send_bitset[n]) {
 				send_bitset[n] = true;
-				cerr << "Returning " << n << " as send ID\n";
 				return n;
 				
 			}
diff --git a/libs/ardour/session_export.cc b/libs/ardour/session_export.cc
index 82dd23f724..87bf5a5b03 100644
--- a/libs/ardour/session_export.cc
+++ b/libs/ardour/session_export.cc
@@ -267,7 +267,7 @@ AudioExportSpecification::process (nframes_t nframes)
 	char errbuf[256];
 	nframes_t to_write = 0;
 	int cnt = 0;
-
+	
 	do {
 
 		/* now do sample rate conversion */
@@ -427,8 +427,6 @@ AudioExportSpecification::process (nframes_t nframes)
 int
 Session::start_audio_export (AudioExportSpecification& spec)
 {
-	int ret;
-
 	if (spec.prepare (current_block_size, frame_rate())) {
 		return -1;
 	}
@@ -436,40 +434,21 @@ Session::start_audio_export (AudioExportSpecification& spec)
 	spec.pos = spec.start_frame;
 	spec.end_frame = spec.end_frame;
 	spec.total_frames = spec.end_frame - spec.start_frame;
+	spec.running = true; 
+	spec.do_freewheel = false; /* force a call to ::prepare_to_export() before proceeding to normal operation */
 
 	spec.freewheel_connection = _engine.Freewheel.connect (sigc::bind (mem_fun (*this, &Session::process_export), &spec));
 
-	if ((ret = _engine.freewheel (true)) == 0) {
-		spec.running = true; 
-		spec.do_freewheel = false;
-	}
-
-	return ret;
+	return _engine.freewheel (true);
 }
 
 int
 Session::stop_audio_export (AudioExportSpecification& spec)
 {
-	/* can't use stop_transport() here because we need
-	   an immediate halt and don't require all the declick
-	   stuff that stop_transport() implements.
-	*/
+	/* don't stop freewheeling but do stop paying attention to it for now */
 
-	realtime_stop (true);
-	schedule_butler_transport_work ();
-
-	/* restart slaving */
-
-	if (post_export_slave != None) {
-		Config->set_slave_source (post_export_slave);
-	} else {
-		locate (post_export_position, false, false, false);
-	}
-
-	spec.clear ();
-	_exporting = false;
-
-	spec.running = false;
+	spec.freewheel_connection.disconnect ();
+	spec.clear (); /* resets running/stop etc */
 
 	return 0;
 }
@@ -639,3 +618,25 @@ Session::process_export (nframes_t nframes, AudioExportSpecification* spec)
 	return ret;
 }
 
+void
+Session::finalize_audio_export ()
+{
+	_engine.freewheel (false);
+	_exporting = false;
+
+	/* can't use stop_transport() here because we need
+	   an immediate halt and don't require all the declick
+	   stuff that stop_transport() implements.
+	*/
+
+	realtime_stop (true);
+	schedule_butler_transport_work ();
+
+	/* restart slaving */
+
+	if (post_export_slave != None) {
+		Config->set_slave_source (post_export_slave);
+	} else {
+		locate (post_export_position, false, false, false);
+	}
+}
diff --git a/libs/pbd/pbd/abstract_ui.cc b/libs/pbd/pbd/abstract_ui.cc
index 6c3f0bac7f..97f19e1fe5 100644
--- a/libs/pbd/pbd/abstract_ui.cc
+++ b/libs/pbd/pbd/abstract_ui.cc
@@ -54,6 +54,8 @@ AbstractUI<RequestObject>::get_request (RequestType rt)
 	}
 	
 	RequestBufferVector vec;
+	vec.buf[0] = 0;
+	vec.buf[1] = 0;
 	
 	rbuf->get_write_vector (&vec);
 
diff --git a/libs/pbd/stacktrace.cc b/libs/pbd/stacktrace.cc
index 6495009765..8a6eb606b2 100644
--- a/libs/pbd/stacktrace.cc
+++ b/libs/pbd/stacktrace.cc
@@ -23,7 +23,7 @@ PBD::stacktrace (std::ostream& out, int levels)
 
 		printf ("Obtained %zd stack frames.\n", size);
 		
-		for (i = 0; i < size && (levels == 0 || i < levels); i++) {
+		for (i = 0; i < size && (levels == 0 || i < size_t(levels)); i++) {
 			out << strings[i] << std::endl;
 		}
 		
diff --git a/libs/pbd/strsplit.cc b/libs/pbd/strsplit.cc
index 80da357cc0..1fb6112150 100644
--- a/libs/pbd/strsplit.cc
+++ b/libs/pbd/strsplit.cc
@@ -56,7 +56,7 @@ split (ustring str, vector<ustring>& result, char splitchar)
 	}
 
 	for (ustring::size_type n = 0; n < len; ++n) {
-		if (str[n] == splitchar) {
+		if (str[n] == gunichar(splitchar)) {
 			cnt++;
 		}
 	}
diff --git a/libs/soundtouch/RateTransposer.cpp b/libs/soundtouch/RateTransposer.cpp
index 740d099239..493d5326f2 100644
--- a/libs/soundtouch/RateTransposer.cpp
+++ b/libs/soundtouch/RateTransposer.cpp
@@ -339,7 +339,7 @@ void RateTransposer::clear()
 
 
 // Returns nonzero if there aren't any samples available for outputting.
-uint RateTransposer::isEmpty()
+int RateTransposer::isEmpty() const
 {
     int res;
 
diff --git a/libs/soundtouch/RateTransposer.h b/libs/soundtouch/RateTransposer.h
index f7c03f759e..5315d6fec3 100644
--- a/libs/soundtouch/RateTransposer.h
+++ b/libs/soundtouch/RateTransposer.h
@@ -150,7 +150,7 @@ public:
     void clear();
 
     /// Returns nonzero if there aren't any samples available for outputting.
-    uint isEmpty();
+    int isEmpty() const;
 };
 
 }
diff --git a/libs/soundtouch/TDStretch.cpp b/libs/soundtouch/TDStretch.cpp
index f1b85b5f17..c71c65967f 100644
--- a/libs/soundtouch/TDStretch.cpp
+++ b/libs/soundtouch/TDStretch.cpp
@@ -114,13 +114,6 @@ TDStretch::~TDStretch()
 
 
     
-// Calculates the x having the closest 2^x value for the given value
-static int _getClosest2Power(double value)
-{
-    return (int)(log(value) / log(2.0) + 0.5);
-}
-
-
 
 // Sets routine control parameters. These control are certain time constants
 // defining how the sound is stretched to the desired duration.