diff --git a/CMakeLists.txt b/CMakeLists.txt
index f492195..f0aa217 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,7 @@ set(LUPPP_VERSION_PATCH "1")
 set(LUPPP_VERSION "${LUPPP_VERSION_MAJOR}.${LUPPP_VERSION_MINOR}.${LUPPP_VERSION_PATCH}")
 
 option(BUILD_TESTS "Build test version" OFF)
+option(WITH_ASAN "Build address sanitized version" OFF)
 
 
 #set(CMAKE_VERBOSE_MAKEFILE on)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7b44db1..69454fa 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -50,7 +50,14 @@ IF(RELEASE_BUILD)
   SET(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -g -Wall -W -Wno-unused-variable ")
 ENDIF(RELEASE_BUILD)
 
-if( ${ARCHITECTURE} STREQUAL "x86_64" )
+IF(WITH_ASAN)
+  SET(CMAKE_C_COMPILER "/usr/bin/clang")
+  SET(CMAKE_CXX_COMPILER "/usr/bin/clang++")
+  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -g -fsanitize=address -fno-omit-frame-pointer")
+  SET(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -O0 -g -fsanitize=address -fno-omit-frame-pointer")
+ENDIF()
+
+if( ${ARCHITECTURE} STREQUAL "x86_64" AND NOT WITH_ASAN)
   set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -O3 -msse2")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3 -msse2")
 else()
@@ -63,6 +70,12 @@ FILE(GLOB sources *.cxx  avtk/*.cxx cjson/*.c controller/*.cxx dsp/*.cxx observe
 # Compile binary
 add_executable (luppp version.hxx ${sources} )
 
+# require a C++11 compiler
+set_target_properties(luppp PROPERTIES 
+    CXX_STANDARD 11 
+    CXX_STANDARD_REQUIRED YES
+    CXX_EXTENSIONS NO
+)
 
 # Linking
 target_link_libraries( luppp ${JACK_LIBRARIES}       )
diff --git a/src/avtk/avtk_background.h b/src/avtk/avtk_background.h
index 6fc07c0..2ce1d5c 100644
--- a/src/avtk/avtk_background.h
+++ b/src/avtk/avtk_background.h
@@ -34,33 +34,18 @@ class Background : public Fl_Widget
 {
 public:
 	Background(int _x, int _y, int _w, int _h, const char *_label = 0):
-		Fl_Widget(_x, _y, _w, _h, _label)
+		Fl_Widget(_x, _y, _w, _h)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
 		h = _h;
 
-		label = strdup(_label);
-
 		highlight = false;
 	}
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
-
-	void setLabel(const char* l)
-	{
-		if( label )
-			free( (char*) label);
-
-		label = strdup( l );
-		redraw();
-	}
-	const char* getLabel()
-	{
-		return label;
-	}
 
 	void draw()
 	{
@@ -87,7 +72,7 @@ public:
 			cairo_move_to( cr, x + 10, y + 14 );
 			cairo_set_source_rgba( cr, 0 / 255.f, 153 / 255.f , 255 / 255.f , 1 );
 			cairo_set_font_size( cr, 10 );
-			cairo_show_text( cr, label );
+			cairo_show_text( cr, label() );
 
 			// lower stripe
 			cairo_move_to( cr, x    , y + 20 );
@@ -122,8 +107,7 @@ public:
 			if ( Fl::event_state(FL_BUTTON3) && Fl::event_y() < y + 20 ) {
 				const char* name = fl_input( "Track name: ", "" );
 				if ( name ) {
-					free( (char*) label );
-					label = strdup( name );
+					copy_label(name);
 					redraw();
 				}
 				return 1;
diff --git a/src/avtk/avtk_box.h b/src/avtk/avtk_box.h
index f36525b..ffde3c1 100644
--- a/src/avtk/avtk_box.h
+++ b/src/avtk/avtk_box.h
@@ -30,8 +30,9 @@ class Box : public Fl_Widget
 {
 public:
 	Box(int _x, int _y, int _w, int _h, const char *_label = 0):
-		Fl_Widget(_x, _y, _w, _h, _label)
+		Fl_Widget(_x, _y, _w, _h)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
@@ -39,29 +40,13 @@ public:
 
 		r = g = b = 0;
 
-		label = strdup(_label);
-
 		highlight = false;
 	}
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
 
 	int r,g,b;
 
-	void setLabel(const char* l)
-	{
-		if( label )
-			free( (char*) label);
-
-		label = strdup( l );
-		redraw();
-	}
-	const char* getLabel()
-	{
-		return label;
-	}
-
 	void setColor( int red, int green, int blue )
 	{
 		r = red;
diff --git a/src/avtk/avtk_button.h b/src/avtk/avtk_button.h
index 3fe7996..790c92f 100644
--- a/src/avtk/avtk_button.h
+++ b/src/avtk/avtk_button.h
@@ -20,7 +20,7 @@
 #ifndef AVTK_BUTTON_H
 #define AVTK_BUTTON_H
 
-#include <FL/Fl_Button.H>
+#include <ntk/FL/Fl_Button.H>
 
 namespace Avtk
 {
@@ -29,16 +29,14 @@ class Button : public Fl_Button
 {
 public:
 	Button(int _x, int _y, int _w, int _h, const char *_label):
-		Fl_Button(_x, _y, _w, _h, _label)
+		Fl_Button(_x, _y, _w, _h)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
 		h = _h;
 
-		labelMe = _label;
-		setLabel( labelMe );
-
 		_r = 1.0;
 		_g = 0.48;
 		_b = 0.0;
@@ -63,14 +61,6 @@ public:
 	bool mouseOver;
 	bool highlight;
 	int x, y, w, h;
-	const char* labelMe;
-
-	void setLabel( const char* l)
-	{
-		labelMe = l;
-		label( labelMe );
-		redraw();
-	}
 
 	float _r, _g, _b;       // foreground colour
 	float _bgr, _bgg, _bgb; // background colour
diff --git a/src/avtk/avtk_dial.h b/src/avtk/avtk_dial.h
index 7012f51..543aa47 100644
--- a/src/avtk/avtk_dial.h
+++ b/src/avtk/avtk_dial.h
@@ -44,13 +44,6 @@ public:
 		mouseClicked = false;
 
 		highlight = false;
-		_label = strdup( _lab );
-	}
-
-	~Dial()
-	{
-		if( _label )
-			free( _label );
 	}
 
 	bool highlight;
@@ -66,17 +59,6 @@ public:
 
 	bool drawLabel;
 
-	void setLabel( const char* newLabel )
-	{
-		if( _label )
-			free( _label );
-
-		_label = strdup( newLabel );
-
-		label( _label );
-		redraw();
-	}
-
 	void draw()
 	{
 		if (damage() & FL_DAMAGE_ALL) {
diff --git a/src/avtk/avtk_light_button.h b/src/avtk/avtk_light_button.h
index 441a1ca..c664e76 100644
--- a/src/avtk/avtk_light_button.h
+++ b/src/avtk/avtk_light_button.h
@@ -29,7 +29,7 @@ class LightButton : public Fl_Button
 {
 public:
 	LightButton(int _x, int _y, int _w, int _h, const char *_label):
-		Fl_Button(_x, _y, _w, _h, _label)
+		Fl_Button(_x, _y, _w, _h)
 	{
 		x = _x;
 		y = _y;
@@ -48,8 +48,6 @@ public:
 		_outg = _g;
 		_outb = _b;
 
-		label = _label;
-
 		_highlight = false;
 		mouseOver = false;
 	}
@@ -57,7 +55,6 @@ public:
 	bool mouseOver;
 	bool _highlight;
 	int x, y, w, h;
-	const char* label;
 	float _r, _g, _b;       // foreground colour
 	float _bgr, _bgg, _bgb; // background colour
 	float _outr, _outg, _outb; // outline colour
diff --git a/src/avtk/avtk_radial_status.h b/src/avtk/avtk_radial_status.h
index 29227e9..ea1cc01 100644
--- a/src/avtk/avtk_radial_status.h
+++ b/src/avtk/avtk_radial_status.h
@@ -29,15 +29,14 @@ class RadialStatus : public Fl_Slider
 {
 public:
 	RadialStatus(int _x, int _y, int _w, int _h, const char *_label = 0):
-		Fl_Slider(_x, _y, _w, _h, _label)
+		Fl_Slider(_x, _y, _w, _h)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
 		h = _h;
 
-		label = _label;
-
 		previousAngle = -1;
 
 		_r = 1.0;
@@ -64,8 +63,6 @@ public:
 	bool mouseOver;
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
-
 	int previousAngle;
 
 	float _r, _g, _b;       // foreground colour
diff --git a/src/avtk/avtk_reverb.h b/src/avtk/avtk_reverb.h
index a3a05d3..c93692b 100644
--- a/src/avtk/avtk_reverb.h
+++ b/src/avtk/avtk_reverb.h
@@ -29,8 +29,9 @@ class Reverb : public Fl_Slider
 {
 public:
 	Reverb(int _x, int _y, int _w, int _h, const char *_label =0):
-		Fl_Slider(_x, _y, _w, _h, _label)
+		Fl_Slider(_x, _y, _w, _h)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
@@ -42,8 +43,6 @@ public:
 
 		active = false;
 
-		label = _label;
-
 		highlight = false;
 		mouseOver = false;
 	}
@@ -96,7 +95,6 @@ public:
 	bool mouseOver;
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
 
 	void draw()
 	{
diff --git a/src/avtk/avtk_sidechain_gain.h b/src/avtk/avtk_sidechain_gain.h
index b141230..8bc2493 100644
--- a/src/avtk/avtk_sidechain_gain.h
+++ b/src/avtk/avtk_sidechain_gain.h
@@ -34,15 +34,14 @@ class SidechainGain : public Fl_Slider
 {
 public:
 	SidechainGain(int _x, int _y, int _w, int _h, const char *_label = 0):
-		Fl_Slider(_x, _y, _w, _h, _label)
+		Fl_Slider(_x, _y, _w, _h)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
 		h = _h;
 
-		label = _label;
-
 		mouseClickedX = 0;
 		mouseClickedY = 0;
 		mouseClicked = false;
@@ -84,7 +83,6 @@ public:
 	bool active;
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
 
 	int mouseClickedX;
 	int mouseClickedY;
diff --git a/src/avtk/avtk_unit.h b/src/avtk/avtk_unit.h
index 9bc4bb7..c2626c8 100644
--- a/src/avtk/avtk_unit.h
+++ b/src/avtk/avtk_unit.h
@@ -57,15 +57,14 @@ class Unit : public Fl_Button
 {
 public:
 	Unit(int _x, int _y, int _w, int _h, const char *_label):
-		Fl_Button(_x, _y, _w, _h, _label)
+		Fl_Button(_x, _y, _w, _h)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
 		h = _h;
 
-		label = _label;
-
 		highlight = false;
 		mouseOver = false;
 
@@ -83,7 +82,6 @@ public:
 	bool mouseOver;
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
 
 	void draw()
 	{
diff --git a/src/avtk/bindings.cxx b/src/avtk/bindings.cxx
index 3800886..fd68e65 100644
--- a/src/avtk/bindings.cxx
+++ b/src/avtk/bindings.cxx
@@ -27,15 +27,14 @@ namespace Avtk
 {
 
 Bindings::Bindings( int _x, int _y, int _w, int _h, const char *_label ) :
-	Fl_Button(_x, _y, _w, _h, _label)
+	Fl_Button(_x, _y, _w, _h)
 {
+	copy_label(_label);
 	x = _x;
 	y = _y;
 	w = _w;
 	h = _h;
 
-	label = _label;
-
 	bindYPx = 25;
 
 	highlight = false;
diff --git a/src/avtk/bindings.h b/src/avtk/bindings.h
index bc82a79..d6cda6a 100644
--- a/src/avtk/bindings.h
+++ b/src/avtk/bindings.h
@@ -37,7 +37,6 @@ public:
 	bool mouseOver;
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
 
 	void add( Binding* b );
 
diff --git a/src/avtk/clipselector.cxx b/src/avtk/clipselector.cxx
index 738e81a..b0ab6bf 100644
--- a/src/avtk/clipselector.cxx
+++ b/src/avtk/clipselector.cxx
@@ -32,8 +32,9 @@ namespace Avtk
 
 ClipSelector::ClipSelector( int _x, int _y, int _w, int _h,
                             const char *_label, bool master ) :
-	Fl_Button(_x, _y, _w, _h, _label)
+	Fl_Button(_x, _y, _w, _h)
 {
+	copy_label(_label);
 	x = _x;
 	y = _y;
 	w = _w;
@@ -41,7 +42,6 @@ ClipSelector::ClipSelector( int _x, int _y, int _w, int _h,
 
 	special = -1;
 
-	label = _label;
 	_master = master;
 
 	if ( _master ) {
diff --git a/src/avtk/clipselector.hxx b/src/avtk/clipselector.hxx
index 1b688f2..35ba47d 100644
--- a/src/avtk/clipselector.hxx
+++ b/src/avtk/clipselector.hxx
@@ -89,7 +89,6 @@ public:
 	bool mouseOver;
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
 
 	void setID( int id );
 
diff --git a/src/avtk/volume.cxx b/src/avtk/volume.cxx
index 9a3deda..e24e85a 100644
--- a/src/avtk/volume.cxx
+++ b/src/avtk/volume.cxx
@@ -21,15 +21,14 @@
 using namespace Avtk;
 
 Volume::Volume(int _x, int _y, int _w, int _h, const char *_label ):
-	Fl_Slider(_x, _y, _w, _h, _label)
+	Fl_Slider(_x, _y, _w, _h)
 {
+	copy_label(_label);
 	x = _x;
 	y = _y;
 	w = _w;
 	h = _h;
 
-	label = _label;
-
 	mouseClickedX = 0;
 	mouseClickedY = 0;
 	mouseClicked = false;
diff --git a/src/avtk/volume.hxx b/src/avtk/volume.hxx
index ae592d0..106f0cc 100644
--- a/src/avtk/volume.hxx
+++ b/src/avtk/volume.hxx
@@ -52,7 +52,6 @@ private:
 	bool orientationHorizontal;
 
 	int x, y, w, h;
-	const char* label;
 
 	int mouseClickedX;
 	int mouseClickedY;
diff --git a/src/avtk/waveform.h b/src/avtk/waveform.h
index 32cca90..47688bc 100644
--- a/src/avtk/waveform.h
+++ b/src/avtk/waveform.h
@@ -35,29 +35,27 @@ class Waveform : public Fl_Widget
 {
 public:
 	Waveform(int _x, int _y, int _w, int _h, const char *_label=0 ):
-		Fl_Widget(_x, _y, _w, _h, _label)
+		Fl_Widget(_x, _y, _w, _h), 
+		data(_w)
 	{
+		copy_label(_label);
 		x = _x;
 		y = _y;
 		w = _w;
 		h = _h;
 
-		label = _label;
-
 		highlight = false;
 		newWaveform = false;
 
 		waveformCr = 0;
 		waveformSurf = 0;
 
-
-		data = (float*)malloc( sizeof(float) * w );
-
 		srand (time(NULL));
 
-		for (int i = 0; i < _w; i++) {
-			data[i] = rand() / RAND_MAX / 0.75;
-		}
+		std::generate(data.begin(), data.end(), []() -> float {
+				return rand() / RAND_MAX / 0.75;
+			}
+		);
 
 		newWaveform = true;
 
@@ -67,7 +65,6 @@ public:
 	bool strokeRim;
 	bool highlight;
 	int x, y, w, h;
-	const char* label;
 
 	cairo_t*          waveformCr;
 	cairo_surface_t*  waveformSurf;
@@ -75,13 +72,12 @@ public:
 	bool newWaveform;
 
 	long   dataSize;
-	float* data;
+	std::vector<float> data;
 
-	void setData( float* d, long size )
+	void setData( const std::vector<float>& newdata )
 	{
 		//cout << "AvtkWaveform: setDataPtr = " << data << endl;
-		dataSize = size;
-		data = d;
+		data = newdata;
 		newWaveform = true;
 
 
@@ -137,7 +133,7 @@ public:
 				cairo_set_dash ( waveformCr, dashes, 0, 0.0);
 
 
-				if ( !data ) {
+				if ( !data.empty() ) {
 					// draw X
 					cairo_move_to( cr,  0    , 0     );
 					cairo_line_to( cr,  0 + w, 0 + h );
@@ -241,11 +237,8 @@ public:
 
 		// FIXME: needs to be resampled, not clipped at end
 		// delete old data, and resize it
-		float* newData = (float*)malloc( sizeof(float) * w );
 
-		memcpy( newData, data, newSize );
-		free ( data );
-		data = newData;
+		data.resize(w);
 
 		newWaveform = true;
 
diff --git a/src/diskreader.cxx b/src/diskreader.cxx
index 6f16839..be8d488 100644
--- a/src/diskreader.cxx
+++ b/src/diskreader.cxx
@@ -596,7 +596,7 @@ int DiskReader::readTracks()
 					if( !name ) {
 						LUPPP_WARN("Track %i has no name data saved.", t);
 					} else {
-						gui->getTrack(t)->bg.setLabel( name->valuestring );
+						gui->getTrack(t)->bg.copy_label( name->valuestring );
 					}
 				}
 				// fader
diff --git a/src/diskwriter.cxx b/src/diskwriter.cxx
index 4908730..aa93358 100644
--- a/src/diskwriter.cxx
+++ b/src/diskwriter.cxx
@@ -88,7 +88,14 @@ DiskWriter::DiskWriter()
 	} else {
 		LUPPP_NOTE("Creating .config/openAV/luppp directory");
 	}
-};
+}
+
+DiskWriter::~DiskWriter()
+{
+	// reset the cJSON objects
+	cJSON_Delete( sessionJson );
+	cJSON_Delete( audioJson   );
+}
 
 void DiskWriter::initialize(std::string path, std::string name )
 {
@@ -396,7 +403,7 @@ int DiskWriter::writeSession()
 
 		// add track metadata: volumes, sends etc
 		cJSON_AddNumberToObject( track, "ID", t );
-		cJSON_AddStringToObject( track, "name", gui->getTrack(t)->bg.getLabel() );
+		cJSON_AddStringToObject( track, "name", gui->getTrack(t)->bg.label() );
 
 		cJSON_AddNumberToObject( track, "fader", gui->getTrack(t)->getVolume()->value() );
 		cJSON_AddNumberToObject( track, "pan", gui->getTrack(t)->getPan());
diff --git a/src/diskwriter.hxx b/src/diskwriter.hxx
index 838d781..215bf42 100644
--- a/src/diskwriter.hxx
+++ b/src/diskwriter.hxx
@@ -54,6 +54,7 @@ class DiskWriter
 {
 public:
 	DiskWriter();
+	~DiskWriter();
 
 	/// sets up session write path etc
 	void initialize( std::string path, std::string sessionName );
@@ -82,8 +83,8 @@ public:
 #endif
 
 private:
-	cJSON* sessionJson;
-	cJSON* audioJson;
+	cJSON* sessionJson = nullptr;
+	cJSON* audioJson = nullptr;
 
 	bool foldersCreated;
 	std::string sessionName;
diff --git a/src/gaudioeditor.cxx b/src/gaudioeditor.cxx
index 4b80275..e0f08f0 100644
--- a/src/gaudioeditor.cxx
+++ b/src/gaudioeditor.cxx
@@ -105,8 +105,8 @@ void AudioEditor::show( AudioBuffer* buf, bool modal )
 	}
 
 	std::vector<float>& tmp = ab->getDataL();
-	int size = tmp.size();
-	waveform->setData( &tmp[0], size );
+	const auto size = tmp.size();
+	waveform->setData( tmp );
 
 	const int beats[]= {1,2,4,8,16,32,64};
 
diff --git a/src/gmastertrack.cxx b/src/gmastertrack.cxx
index c95ab69..e61f3dd 100644
--- a/src/gmastertrack.cxx
+++ b/src/gmastertrack.cxx
@@ -263,7 +263,7 @@ void GMasterTrack::setBpm( int b )
 	tempoDial.value( ( bpm - 60 ) / 160.f );
 	std::stringstream s;
 	s << bpm;
-	tempoDial.setLabel( s.str().c_str() );
+	tempoDial.copy_label( s.str().c_str() );
 }
 
 void GMasterTrack::setInputVol(float f)
diff --git a/src/gui.cxx b/src/gui.cxx
index 68daadb..3aaf3cd 100644
--- a/src/gui.cxx
+++ b/src/gui.cxx
@@ -442,7 +442,7 @@ Gui::Gui(const char* argZero) :
 		for (; i < NTRACKS; i++ ) {
 			stringstream s;
 			s << "Track " << i+1;
-			tracks.push_back( new GTrack(8 + i * 118, 40, 110, 650, s.str().c_str() ) );
+			tracks.push_back( std::make_shared<GTrack>(8 + i * 118, 40, 110, 650, s.str().c_str() ) );
 		}
 		master = new GMasterTrack(8 + i * 118, 40, 150, 650, "Master");
 	}
@@ -515,7 +515,7 @@ void Gui::reset()
 	for(unsigned int i = 0; i < NTRACKS; i++) {
 		stringstream s;
 		s << "Track " << i+1;
-		tracks.at(i)->bg.setLabel( s.str().c_str() );
+		tracks.at(i)->bg.copy_label( s.str().c_str() );
 
 		for(unsigned int s = 0; s < NSCENES; s++) {
 			tracks.at(i)->getClipSelector()->clipName( s, "" );
@@ -530,7 +530,7 @@ void Gui::reset()
 
 }
 
-GTrack* Gui::getTrack(int id)
+std::shared_ptr<GTrack> Gui::getTrack(int id) const
 {
 	return tracks.at(id);
 }
@@ -915,10 +915,4 @@ Gui::~Gui()
 	delete diskWriter;
 
 	delete master;
-
-	for(unsigned int i = 0; i < tracks.size(); i++) {
-		delete tracks.at(i);
-	}
-
-
 }
diff --git a/src/gui.hxx b/src/gui.hxx
index 3fcd473..52520f7 100644
--- a/src/gui.hxx
+++ b/src/gui.hxx
@@ -21,6 +21,7 @@
 
 #include <vector>
 #include <string>
+#include <memory>
 
 #include <FL/Fl.H>
 #include <FL/Fl_Double_Window.H>
@@ -68,7 +69,7 @@ public:
 	void addMidiControllerToSetup(std::string);
 	void setupMidiControllers();
 
-	GTrack* getTrack(int id);
+    std::shared_ptr<GTrack> getTrack(int id) const;
 	GMasterTrack* getMasterTrack()
 	{
 		return master;
@@ -137,7 +138,7 @@ private:
 
 	GMasterTrack*       master;
 
-	vector<GTrack*>     tracks;
+	vector<std::shared_ptr<GTrack>>     tracks;
 
 	// FIXME: refactor tooltip code out..?
 	std::string         tooltip;
diff --git a/src/main.cxx b/src/main.cxx
index c4cc787..066bad0 100644
--- a/src/main.cxx
+++ b/src/main.cxx
@@ -39,8 +39,8 @@ jack_ringbuffer_t* rbToDsp = 0;
 jack_ringbuffer_t* rbToGui = 0;
 
 // global static pointers, for access from EventHandlerGui and EventHandlerDsp
-Gui * gui  = 0;
-Jack* jack = 0;
+Gui * gui  = nullptr;
+Jack* jack = nullptr;
 
 
 void signalHanlder(int signum)
@@ -130,6 +130,7 @@ int main(int argc, char** argv)
 
 	gui->show();
 
+    delete gui;
 
 	return 0;
 }