diff --git a/include/app.hpp b/include/app.hpp
index 35398c22..e5465bc3 100644
--- a/include/app.hpp
+++ b/include/app.hpp
@@ -46,6 +46,8 @@ struct SVGPanel;
 static const float RACK_GRID_WIDTH = 15;
 static const float RACK_GRID_HEIGHT = 380;
 static const Vec RACK_GRID_SIZE = Vec(RACK_GRID_WIDTH, RACK_GRID_HEIGHT);
+static const std::string PRESET_FILTERS = "VCV Rack module preset (.vcvm):vcvm";
+static const std::string PATCH_FILTERS = "VCV Rack patch (.vcv):vcv";
 
 
 struct ModuleWidget : OpaqueWidget {
@@ -172,6 +174,8 @@ struct RackWidget : OpaqueWidget {
 #endif // USE_VST2
 	json_t *toJson();
 	void fromJson(json_t *rootJ);
+	/** Creates a module and adds it to the rack */
+	ModuleWidget *moduleFromJson(json_t *moduleJ); 
 
 	void addModule(ModuleWidget *m);
 	/** Removes the module and transfers ownership to the caller */
diff --git a/src/app/RackWidget.cpp b/src/app/RackWidget.cpp
index 12a38478..59814b6c 100644
--- a/src/app/RackWidget.cpp
+++ b/src/app/RackWidget.cpp
@@ -398,10 +398,9 @@ json_t *RackWidget::toJson() {
 void RackWidget::fromJson(json_t *rootJ) {
 	std::string message;
 
-   // Dprintf("fromJson: 1\n");
-   vst2_set_shared_plugin_tls_globals();  // update JSON hashtable seed
+   // Dprintf("fromJson: ENTER\n");
 
-   // Dprintf("fromJson: 2\n");
+   vst2_set_shared_plugin_tls_globals();  // update JSON hashtable seed
 
 	// version
 	std::string version;
@@ -410,8 +409,6 @@ void RackWidget::fromJson(json_t *rootJ) {
 		version = json_string_value(versionJ);
 	}
 
-   // Dprintf("fromJson: 3\n");
-
 	// Detect old patches with ModuleWidget::params/inputs/outputs indices.
 	// (We now use Module::params/inputs/outputs indices.)
 	int legacy = 0;
@@ -422,8 +419,6 @@ void RackWidget::fromJson(json_t *rootJ) {
 		info("Loading patch using legacy mode %d", legacy);
 	}
 
-   // Dprintf("fromJson: 4\n");
-
 #ifdef RACK_HOST
    float oversampleFactor = -1.0f;
    int oversampleQuality = -1;
@@ -436,8 +431,6 @@ void RackWidget::fromJson(json_t *rootJ) {
       }
    }
 
-   // Dprintf("fromJson: 5\n");
-
 	// Oversample quality (0..10)
    {
       json_t *oversampleJ = json_object_get(rootJ, "oversampleQuality");
@@ -446,12 +439,8 @@ void RackWidget::fromJson(json_t *rootJ) {
       }
    }
 
-   // Dprintf("fromJson: 6\n");
-
    vst2_oversample_realtime_set(oversampleFactor, oversampleQuality);
 
-   // Dprintf("fromJson: 7\n");
-
    // Oversample channel limit
    int oversampleNumIn = -1;
    int oversampleNumOut = -1;
@@ -464,8 +453,6 @@ void RackWidget::fromJson(json_t *rootJ) {
       }
    }
 
-   // Dprintf("fromJson: 8\n");
-
 	// Oversample output channel limit
    {
       json_t *oversampleJ = json_object_get(rootJ, "oversampleNumOut");
@@ -474,12 +461,8 @@ void RackWidget::fromJson(json_t *rootJ) {
       }
    }
 
-   // Dprintf("fromJson: 9\n");
-
    vst2_oversample_channels_set(oversampleNumIn, oversampleNumOut);
 
-   // Dprintf("fromJson: 10\n");
-
 	// Idle detection mode
    {
       json_t *idleJ = json_object_get(rootJ, "idleDetect");
@@ -511,8 +494,6 @@ void RackWidget::fromJson(json_t *rootJ) {
    }
 #endif // RACK_HOST
 
-   // Dprintf("fromJson: 11\n");
-
 	// modules
 	std::map<int, ModuleWidget*> moduleWidgets;
 	json_t *modulesJ = json_object_get(rootJ, "modules");
@@ -521,78 +502,47 @@ void RackWidget::fromJson(json_t *rootJ) {
 	json_t *moduleJ;
 	json_array_foreach(modulesJ, moduleId, moduleJ) {
 		// Add "legacy" property if in legacy mode
-      // Dprintf("fromJson: 12.1\n");
 		if (legacy) {
 			json_object_set(moduleJ, "legacy", json_integer(legacy));
 		}
-      // Dprintf("fromJson: 12.2\n");
 
 		json_t *pluginSlugJ = json_object_get(moduleJ, "plugin");
 		if (!pluginSlugJ) continue;
-      // Dprintf("fromJson: 12.3\n");
 		json_t *modelSlugJ = json_object_get(moduleJ, "model");
 		if (!modelSlugJ) continue;
-      // Dprintf("fromJson: 12.4\n");
 		std::string pluginSlug = json_string_value(pluginSlugJ);
-      // Dprintf("fromJson: 12.5\n");
 		std::string modelSlug = json_string_value(modelSlugJ);
-      // Dprintf("fromJson: 12.6\n");
 
 		Model *model = pluginGetModel(pluginSlug, modelSlug);
-      // Dprintf("fromJson: 12.7\n");
 		if (!model) {
 			message += stringf("Could not find module \"%s\" of plugin \"%s\"\n", modelSlug.c_str(), pluginSlug.c_str());
 			continue;
 		}
-      // Dprintf("fromJson: 12.8\n");
 
 		// Create ModuleWidget
-// // #ifdef USE_VST2
-// //       if(NULL != model->plugin->set_tls_globals_fxn) {
-// //          model->plugin->set_tls_globals_fxn(model->plugin);
-// //       }
-// // #endif // USE_VST2
-      // Dprintf("fromJson: 12.9\n");
 		ModuleWidget *moduleWidget = model->createModuleWidget();
-      // Dprintf("fromJson: 12.10\n");
 		assert(moduleWidget);
-      // Dprintf("fromJson: 12.11\n");
 		moduleWidget->fromJson(moduleJ);
-      // Dprintf("fromJson: 12.12\n");
 		moduleContainer->addChild(moduleWidget);
-      // Dprintf("fromJson: 12.13\n");
 		moduleWidgets[moduleId] = moduleWidget;
-      // Dprintf("fromJson: 12.14\n");
 	}
 
-   // Dprintf("fromJson: 13\n");
-
 	// wires
 	json_t *wiresJ = json_object_get(rootJ, "wires");
 	if (!wiresJ) return;
-   // Dprintf("fromJson: 14\n");
 	size_t wireId;
 	json_t *wireJ;
 	json_array_foreach(wiresJ, wireId, wireJ) {
-      // Dprintf("fromJson: 14.1\n");
 		int outputModuleId = json_integer_value(json_object_get(wireJ, "outputModuleId"));
-      // Dprintf("fromJson: 14.2\n");
 		int outputId = json_integer_value(json_object_get(wireJ, "outputId"));
-      // Dprintf("fromJson: 14.3\n");
 		int inputModuleId = json_integer_value(json_object_get(wireJ, "inputModuleId"));
-      // Dprintf("fromJson: 14.4\n");
 		int inputId = json_integer_value(json_object_get(wireJ, "inputId"));
-      // Dprintf("fromJson: 14.5\n");
 
 		// Get module widgets
 		ModuleWidget *outputModuleWidget = moduleWidgets[outputModuleId];
-      // Dprintf("fromJson: 14.6\n");
 		if (!outputModuleWidget) continue;
-      // Dprintf("fromJson: 14.7\n");
 		ModuleWidget *inputModuleWidget = moduleWidgets[inputModuleId];
-      // Dprintf("fromJson: 14.8\n");
 		if (!inputModuleWidget) continue;
-      // Dprintf("fromJson: 14.9\n");
 
 		// Get port widgets
 		Port *outputPort = NULL;
@@ -619,31 +569,22 @@ void RackWidget::fromJson(json_t *rootJ) {
 		}
 		if (!outputPort || !inputPort)
 			continue;
-      // Dprintf("fromJson: 14.10\n");
 
 		// Create WireWidget
 		WireWidget *wireWidget = new WireWidget();
-      // Dprintf("fromJson: 14.11\n");
 		wireWidget->fromJson(wireJ);
-      // Dprintf("fromJson: 14.12\n");
 		wireWidget->outputPort = outputPort;
 		wireWidget->inputPort = inputPort;
 		wireWidget->updateWire();
-      // Dprintf("fromJson: 14.13\n");
 		// Add wire to rack
 		wireContainer->addChild(wireWidget);
-      // Dprintf("fromJson: 14.14\n");
 	}
 
-   // Dprintf("fromJson: 15\n");
-
 	// Display a message if we have something to say
 	if (!message.empty()) {
 		osdialog_message(OSDIALOG_WARNING, OSDIALOG_OK, message.c_str());
 	}
 
-   // Dprintf("fromJson: 16\n");
-
 #ifdef USE_VST2
    global_ui->param_info.placeholder_framecount = (30*30)-10;
    global_ui->param_info.last_param_widget = NULL;
@@ -652,6 +593,30 @@ void RackWidget::fromJson(json_t *rootJ) {
    // Dprintf("fromJson: LEAVE\n");
 }
 
+ModuleWidget *RackWidget::moduleFromJson(json_t *moduleJ) {
+	// Get slugs
+	json_t *pluginSlugJ = json_object_get(moduleJ, "plugin");
+	if (!pluginSlugJ)
+		return NULL;
+	json_t *modelSlugJ = json_object_get(moduleJ, "model");
+	if (!modelSlugJ)
+		return NULL;
+	std::string pluginSlug = json_string_value(pluginSlugJ);
+	std::string modelSlug = json_string_value(modelSlugJ);
+
+	// Get Model
+	Model *model = pluginGetModel(pluginSlug, modelSlug);
+	if (!model)
+		return NULL;
+
+	// Create ModuleWidget
+	ModuleWidget *moduleWidget = model->createModuleWidget();
+	assert(moduleWidget);
+	moduleWidget->fromJson(moduleJ);
+	moduleContainer->addChild(moduleWidget);
+	return moduleWidget;
+}
+
 void RackWidget::addModule(ModuleWidget *m) {
    rack::global_ui->app.mtx_param.lock();
 	moduleContainer->addChild(m);