diff --git a/Makefile b/Makefile
index 0c0cc98..93c7b6b 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ LUAJIT ?= 1
 PYTHON ?= 0
 SUPERCOLLIDER ?= 0
 VULT ?= 1
+LIBPD ?= 1
 
 # Vult depends on both LuaJIT and QuickJS
 ifeq ($(VULT), 1)
@@ -37,6 +38,32 @@ $(efsw):
 	cd efsw && cp lib/libefsw-static-release.a $(DEP_PATH)/lib/
 	cd efsw && cp -R include/efsw $(DEP_PATH)/include/
 
+# LibPD
+ifeq ($(LIBPD), 1)
+libpd := dep/lib/libpd.a
+SOURCES += src/LibPDEngine.cpp
+OBJECTS += $(libpd)
+DEPS += $(libpd)
+FLAGS += -Idep/include/libpd
+
+ifdef ARCH_WIN
+	FLAGS += -DPD_INTERNAL -D_WIN32
+	LDFLAGS += -shared -Wl,--export-all-symbols -lws2_32 -lkernel32 -static-libgcc
+endif
+
+
+$(libpd):
+	$(WGET) "https://github.com/chairaudio/libpd/archive/master.tar.gz"
+	$(SHA256) master.tar.gz 9edfd4a7423009a61069fb4b2fa027a62705ffa0dcf23bbb6c220f1c6e709d3d
+	cd dep && $(UNTAR) ../master.tar.gz
+	$(WGET) "https://github.com/pure-data/pure-data/archive/0.50-2.tar.gz"
+	$(SHA256) 0.50-2.tar.gz 0bdc9503d25f71e05ce6d321dd853f4e8082fdea211a59439eddd8105cc8761e
+	cd dep/libpd-master/pure-data && $(UNTAR) ../../../0.50-2.tar.gz --strip-components=1
+	cd dep/libpd-master && make MULTI=true BUILD_LIBPD_STATIC=true ADDITIONAL_CFLAGS='-DPD_LONGINTTYPE="long long"'
+	cd dep/libpd-master && $(MAKE) install prefix="$(DEP_PATH)"
+endif
+
+
 # Duktape
 ifeq ($(DUKTAPE), 1)
 SOURCES += src/DuktapeEngine.cpp
@@ -63,7 +90,6 @@ endif
 $(quickjs):
 	cd dep && git clone "https://github.com/JerrySievert/QuickJS.git"
 	cd dep/QuickJS && git checkout 807adc8ca9010502853d471bd8331cdc1d376b94
-	cd dep/QuickJS && $(MAKE) $(QUICKJS_MAKE_FLAGS)
 	cd dep/QuickJS && $(MAKE) $(QUICKJS_MAKE_FLAGS) install
 endif
 
diff --git a/README.md b/README.md
index 268cc6c..8d6bc4b 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Supported scripting languages:
 - JavaScript (ES2020) (.js)
 - [Lua](https://www.lua.org/) (.lua)
 - [Vult](https://github.com/modlfo/vult) (.vult)
+- [Pure Data](https://puredata.info) (.pd)
 - [Add your own below](#adding-a-script-engine)
 
 [Discussion thread](https://community.vcvrack.com/t/vcv-prototype/3271)
@@ -116,6 +117,23 @@ sudo apt install premake4
 sudo pacman -S premake
 ```
 
+## Build
+### Add path to Rack-SDK
+```bash
+export RACK_DIR=/set/path/to/Rack-SDK/
+```
+
+### load submodules
+```bash
+git submodule update --init --recursive
+```
+
+### Make
+```bash
+make dep
+make
+```
+
 ## Adding a script engine
 
 - Add your scripting language library to the build system so it builds with `make dep`, following the Duktape example in `Makefile`.
@@ -131,4 +149,5 @@ sudo pacman -S premake
 - [Andrew Belt](https://github.com/AndrewBelt): host code, Duktape (JavaScript, not used), LuaJIT (Lua), Python (in development)
 - [Jerry Sievert](https://github.com/JerrySievert): QuickJS (JavaScript)
 - [Leonardo Laguna Ruiz](https://github.com/modlfo): Vult
+- [CHAIR](https://chair.audio) [Clemens Wegener (libpd), Max Neupert (patches)] : libpd
 - add your name here
diff --git a/examples/gain.pd b/examples/gain.pd
new file mode 100644
index 0000000..ebc925e
--- /dev/null
+++ b/examples/gain.pd
@@ -0,0 +1,113 @@
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+#X obj 117 30 adc~ 1 2 3 4 5 6, f 47;
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+#X obj 312 98 *~ 1;
+#X obj 376 98 *~ 1;
+#X obj 442 98 *~ 1;
+#X obj 21 422 print toVCV;
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+#X obj 208 198 == 0;
+#X obj 272 198 == 0;
+#X obj 338 198 == 0;
+#X obj 402 198 == 0;
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+#X obj 21 463 r fromVCV;
+#X obj 19 134 r fromVCV;
+#X obj 21 569 print toVCV;
+#X text 558 52 Usually we'd interpolate here with line~ but VCVRack
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new file mode 100644
index 0000000..64bd183
--- /dev/null
+++ b/examples/rainbow.pd
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diff --git a/examples/template.pd b/examples/template.pd
new file mode 100644
index 0000000..b78ef19
--- /dev/null
+++ b/examples/template.pd
@@ -0,0 +1,44 @@
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diff --git a/examples/vco.pd b/examples/vco.pd
new file mode 100644
index 0000000..fd3316f
--- /dev/null
+++ b/examples/vco.pd
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+#X obj 16 161 pow~ 2, f 8;
+#X obj 16 137 sig~ 2;
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+#X obj 15 346 *~ 5;
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+#X connect 4 0 3 0;
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diff --git a/src/LibPDEngine.cpp b/src/LibPDEngine.cpp
new file mode 100644
index 0000000..19e8c70
--- /dev/null
+++ b/src/LibPDEngine.cpp
@@ -0,0 +1,322 @@
+#include "ScriptEngine.hpp"
+#include "z_libpd.h"
+#include "util/z_print_util.h"
+using namespace rack;
+
+#define BUFFERSIZE MAX_BUFFER_SIZE * NUM_ROWS
+
+
+// there is no multi-instance support for receiving messages from libpd
+// for now, received values for the prototype gui will be stored in global variables
+
+float g_lights[NUM_ROWS][3] = {};
+float g_switchLights[NUM_ROWS][3] = {};
+std::string g_utility[2] = {};
+bool g_display_is_valid = false;
+
+std::vector<std::string> split (const std::string &s, char delim) {
+    std::vector<std::string> result;
+    std::stringstream ss (s);
+    std::string item;
+
+    while (getline (ss, item, delim)) {
+        result.push_back (item);
+    }
+
+    return result;
+}
+
+
+
+struct LibPDEngine : ScriptEngine {
+
+	~LibPDEngine() {
+		libpd_free_instance(_lpd);
+
+	}
+
+	void sendInitialStates(const ProcessBlock* block);
+	static void receiveLights(const char *s);
+	bool knobChanged(const float* knobs, int idx);
+	bool switchChanged(const bool* knobs, int idx);
+	void sendKnob(const int idx, const float value);
+	void sendSwitch(const int idx, const bool value);
+
+	t_pdinstance *_lpd;
+	int _pd_block_size = 64;
+  	int _sampleRate = 0;
+  	int _ticks = 0;
+  	bool _init = true;
+  	
+  	float _old_knobs[NUM_ROWS] = {};
+  	bool  _old_switches[NUM_ROWS] = {};
+  	float _output[BUFFERSIZE] = {};
+  	float _input[BUFFERSIZE] = {};//  = (float*)malloc(1024*2*sizeof(float));
+  	const static std::map<std::string, int> _light_map;
+  	const static std::map<std::string, int> _switchLight_map;
+  	const static std::map<std::string, int> _utility_map;
+
+	std::string getEngineName() override {
+		return "Pure Data";
+	}
+
+	int run(const std::string& path, const std::string& script) override {
+
+		ProcessBlock* block = getProcessBlock();
+	 	_sampleRate = block->sampleRate;
+	 	setBufferSize(_pd_block_size);
+	  	setFrameDivider(1);
+	  	libpd_init();
+	  	_lpd = libpd_new_instance();
+
+	  	libpd_set_printhook((t_libpd_printhook)libpd_print_concatenator);
+		libpd_set_concatenated_printhook( receiveLights );
+
+
+	 	if(libpd_num_instances()>2)
+		{
+			display("Sorry, multi instance support in libpd is under development!");
+			return -1;
+		}
+
+	  	//display(std::to_string(libpd_num_instances()));
+	  	libpd_init_audio(NUM_ROWS, NUM_ROWS, _sampleRate);
+
+	    // compute audio    [; pd dsp 1(
+	  	libpd_start_message(1); // one enstry in list
+	  	libpd_add_float(1.0f);
+	  	libpd_finish_message("pd", "dsp");
+
+	  	std::string version = "pd "+std::to_string(PD_MAJOR_VERSION)+"."+
+									std::to_string(PD_MINOR_VERSION)+"."+
+									std::to_string(PD_BUGFIX_VERSION);
+
+		display(version);
+	  
+	    std::string name = string::filename(path);
+	    std::string dir  = string::directory(path);
+	  	libpd_openfile(name.c_str(), dir.c_str());
+
+	  	sendInitialStates(block);
+	  
+		return 0;
+	}
+
+	int process() override {
+		// block
+		ProcessBlock* block = getProcessBlock();
+
+		// get samples prototype
+		int rows = NUM_ROWS;
+		for (int s = 0; s < _pd_block_size; s++) {
+		    for (int r = 0; r < rows; r++) {
+		      _input[s*rows+r] = block->inputs[r][s];
+		    }
+		}
+		
+		libpd_set_instance(_lpd);
+
+		// knobs
+		for (int i=0; i<NUM_ROWS; i++){
+			if( knobChanged(block->knobs, i) ){
+				sendKnob(i, block->knobs[i]);
+			}
+		}
+		// lights
+		for(int i=0; i<NUM_ROWS; i++){
+			block->lights[i][0] = g_lights[i][0];
+			block->lights[i][1] = g_lights[i][1];
+			block->lights[i][2] = g_lights[i][2];
+		}
+		// switch lights
+		for(int i=0; i<NUM_ROWS; i++){
+			block->switchLights[i][0] = g_switchLights[i][0];
+			block->switchLights[i][1] = g_switchLights[i][1];
+			block->switchLights[i][2] = g_switchLights[i][2];
+		}
+		// switches
+		for(int i=0; i<NUM_ROWS; i++){
+			if( switchChanged(block->switches, i) ){
+				sendSwitch(i, block->switches[i]);
+			}
+		}
+
+		// display
+		if(g_display_is_valid){
+			display(g_utility[1]);
+			g_display_is_valid = false;
+		}
+		// process samples in libpd
+		_ticks = 1;
+		libpd_process_float(_ticks, _input, _output);
+		
+		//return samples to prototype
+		for (int s = 0; s < _pd_block_size; s++) {
+		    for (int r = 0; r < rows; r++) {
+		    	block->outputs[r][s] = _output[s*rows+r]; // scale up again to +-5V signal
+		    	// there is a correction multilpier, because libpd's output is too quiet(?)
+		    }
+		  }
+
+		return 0;
+	}
+};
+
+
+__attribute__((constructor(1000)))
+static void constructor() {
+	addScriptEngine<LibPDEngine>("pd");
+}
+
+
+void LibPDEngine::receiveLights(const char *s) {
+	std::string str = std::string(s);
+	std::vector<std::string> atoms = split (str, ' ');
+
+	if(atoms[0]=="toVCV:"){
+		// parse lights list
+		bool light_is_valid = true;
+		int light_idx = -1;
+		try {
+				light_idx = _light_map.at(atoms[1]);      // map::at throws an out-of-range
+			}
+		catch (const std::out_of_range& oor) {
+			light_is_valid = false;
+			//display("Warning:"+atoms[1]+" not found!");
+		}
+		//std::cout << v[1] << ", " << g_led_map[v[1]] << std::endl;
+		if(light_is_valid && atoms.size()==5){
+			g_lights[light_idx][0] = stof(atoms[2]); // red
+			g_lights[light_idx][1] = stof(atoms[3]); // green
+			g_lights[light_idx][2] = stof(atoms[4]); // blue
+		}
+		else {
+			// error
+		}
+		// parse switch lights list
+		bool switchLight_is_valid = true;
+		int switchLight_idx = -1;
+		try {
+				switchLight_idx = _switchLight_map.at(atoms[1]);      // map::at throws an out-of-range
+			}
+		catch (const std::out_of_range& oor) {
+			switchLight_is_valid = false;
+			//display("Warning:"+atoms[1]+" not found!");
+		}
+		//std::cout << v[1] << ", " << g_led_map[v[1]] << std::endl;
+		if(switchLight_is_valid && atoms.size()==5){
+			g_switchLights[switchLight_idx][0] = stof(atoms[2]); // red
+			g_switchLights[switchLight_idx][1] = stof(atoms[3]); // green
+			g_switchLights[switchLight_idx][2] = stof(atoms[4]); // blue
+		}
+		else {
+			// error
+		}
+
+		// parse switch lights list
+		bool utility_is_valid = true;
+		try {
+				_utility_map.at(atoms[1]);      // map::at throws an out-of-range
+			}
+		catch (const std::out_of_range& oor) {
+			utility_is_valid = false;
+			//g_display_is_valid = true;
+			//display("Warning:"+atoms[1]+" not found!");
+		}
+		//std::cout << v[1] << ", " << g_led_map[v[1]] << std::endl;
+		if(utility_is_valid && atoms.size()>=3){
+			g_utility[0] = atoms[1]; // display
+			g_utility[1] = {""}; 
+			for(unsigned i=0; i<atoms.size()-2; i++){
+				g_utility[1] += " " +atoms[i+2]; // concatenate message
+			}
+			g_display_is_valid = true;
+		}
+		else {
+			// error
+		}
+	}
+	else { 
+		// print out on command line
+		std::cout << "libpd prototype unrecognizes message: " << std::string(s) << std::endl;
+	}
+}
+
+bool LibPDEngine::knobChanged(const float* knobs, int i){
+	bool knob_changed = false;
+	if (_old_knobs[i] != knobs[i]){
+		knob_changed = true;
+		_old_knobs[i] = knobs[i];
+	}
+	return knob_changed;
+}
+
+bool LibPDEngine::switchChanged(const bool* switches, int i){
+	bool switch_changed = false;
+	if (_old_switches[i] != switches[i]){
+		switch_changed = true;
+		_old_switches[i] = switches[i];
+	}
+	return switch_changed;
+}
+
+const std::map<std::string, int> LibPDEngine::_light_map{
+	{ "L1", 0 },
+	{ "L2", 1 },
+	{ "L3", 2 },
+	{ "L4", 3 },
+	{ "L5", 4 },
+ 	{ "L6", 5 }
+};
+
+const std::map<std::string, int> LibPDEngine::_switchLight_map{
+	{ "S1", 0 },
+	{ "S2", 1 },
+	{ "S3", 2 },
+	{ "S4", 3 },
+	{ "S5", 4 },
+ 	{ "S6", 5 }
+};
+
+const std::map<std::string, int> LibPDEngine::_utility_map{
+	{ "display", 0 }
+};
+
+
+void LibPDEngine::sendKnob(const int idx, const float value){
+	std::string knob = "K"+std::to_string(idx+1);
+	libpd_start_message(1);
+    libpd_add_float(value); 
+    libpd_finish_message("fromVCV", knob.c_str());
+}
+
+void LibPDEngine::sendSwitch(const int idx, const bool value){
+	std::string sw = "S"+std::to_string(idx+1);
+	libpd_start_message(1);
+    libpd_add_float(value); 
+    libpd_finish_message("fromVCV", sw.c_str());
+}
+
+void LibPDEngine::sendInitialStates(const ProcessBlock* block){
+	// knobs
+	for (int i=0; i<NUM_ROWS; i++){
+		sendKnob(i, block->knobs[i]);
+		sendSwitch(i, block->knobs[i]);
+	}
+
+	for(int i=0; i<NUM_ROWS; i++){
+		g_lights[i][0] = 0;
+		g_lights[i][1] = 0;
+		g_lights[i][2] = 0;
+		g_switchLights[i][0] = 0;
+		g_switchLights[i][1] = 0;
+		g_switchLights[i][2] = 0;
+	}
+
+	//g_utility[0] = "";
+	//g_utility[1] = "";
+
+	//g_display_is_valid = false;
+
+	
+}
\ No newline at end of file