diff --git a/.gitmodules b/.gitmodules
index 1968c884..1657af82 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "ext/nanosvg"]
 	path = ext/nanosvg
 	url = https://github.com/memononen/nanosvg.git
+[submodule "ext/dr_libs"]
+	path = ext/dr_libs
+	url = https://github.com/mackron/dr_libs.git
diff --git a/README.md b/README.md
index 04ea0a5e..ebd60f58 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 # Rack
 
-Open source Eurorack-style modular DAW
+Open source virtual Eurorack DAW
 
 ## Building
 
@@ -21,3 +21,9 @@ Install dependencies
 Run `make ARCH=lin` or `make ARCH=win` or `make ARCH=mac`
 
 If the build breaks because you think I've missed a step, feel free to post an issue.
+
+## License
+
+Rack source code by Andrew Belt: BSD-3-Clause
+
+Component Library graphics by [Grayscale](http://grayscale.info/): [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/)
diff --git a/ext/dr_libs b/ext/dr_libs
new file mode 160000
index 00000000..6fb1f8a9
--- /dev/null
+++ b/ext/dr_libs
@@ -0,0 +1 @@
+Subproject commit 6fb1f8a9f8bb3198e05ee52aa38f177c499c1bef
diff --git a/include/components.hpp b/include/components.hpp
index f3cecf24..1fa8ed01 100644
--- a/include/components.hpp
+++ b/include/components.hpp
@@ -440,8 +440,8 @@ struct SilverScrew : Screw {
 
 struct LightPanel : Panel {
 	LightPanel() {
-		backgroundColor = nvgRGB(0xe8, 0xe8, 0xe8);
-		borderColor = nvgRGB(0xa1, 0xa1, 0xa1);
+		backgroundColor = nvgRGB(0xf2, 0xf2, 0xf2);
+		borderColor = nvgRGB(0xb8, 0xb8, 0xb8);
 	}
 };
 
diff --git a/include/dsp.hpp b/include/dsp.hpp
index 8e9569f8..1e57a9e4 100644
--- a/include/dsp.hpp
+++ b/include/dsp.hpp
@@ -5,6 +5,7 @@
 #include <samplerate.h>
 #include <complex>
 #include "math.hpp"
+#include "../ext/dr_libs/dr_wav.h"
 
 
 namespace rack {
@@ -320,4 +321,23 @@ struct RCFilter {
 };
 
 
+struct PeakFilter {
+	float state = 0.0;
+	float c = 0.0;
+
+	/** Rate is lambda / sampleRate */
+	void setRate(float r) {
+		c = 1.0 - r;
+	}
+	void process(float x) {
+		if (x > state)
+			state = x;
+		state *= c;
+	}
+	float peak() {
+		return state;
+	}
+};
+
+
 } // namespace rack
diff --git a/include/gui.hpp b/include/gui.hpp
index b25488da..6e26909c 100644
--- a/include/gui.hpp
+++ b/include/gui.hpp
@@ -8,6 +8,7 @@ namespace rack {
 void guiInit();
 void guiDestroy();
 void guiRun();
+bool guiIsKeyPressed(int key);
 void guiCursorLock();
 void guiCursorUnlock();
 const char *guiSaveDialog(const char *filters, const char *filename);
diff --git a/include/math.hpp b/include/math.hpp
index d2f3336a..ae14bfec 100644
--- a/include/math.hpp
+++ b/include/math.hpp
@@ -44,6 +44,11 @@ inline bool ispow2(int n) {
 // float functions
 ////////////////////
 
+/** Returns 1.0 for positive numbers and -1.0 for negative numbers (including positive/negative zero) */
+inline float sgnf(float x) {
+	return copysignf(1.0, x);
+}
+
 inline float radtodeg(float x) {
 	return x * (180.0 / M_PI);
 }
diff --git a/include/widgets.hpp b/include/widgets.hpp
index e6ed277d..3dc40941 100644
--- a/include/widgets.hpp
+++ b/include/widgets.hpp
@@ -191,6 +191,10 @@ Events are not passed to the underlying scene.
 struct FramebufferWidget : virtual Widget {
 	/** Set this to true to re-render the scene to the framebuffer in the next step() */
 	bool dirty = true;
+	/** A margin in pixels around the scene in the framebuffer
+	This prevents cutting the rendered SVG off on the box edges.
+	*/
+	int margin = 0;
 	/** The root object in the framebuffer scene
 	The FramebufferWidget owns the pointer
 	*/
diff --git a/src/app.cpp b/src/app.cpp
index 1651a6c1..8434cd36 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -4,7 +4,7 @@
 namespace rack {
 
 std::string gApplicationName = "VCV Rack";
-std::string gApplicationVersion = "v0.1.1 alpha";
+std::string gApplicationVersion = "v0.2.0 alpha";
 
 RackWidget *gRackWidget = NULL;
 
diff --git a/src/app/Knob.cpp b/src/app/Knob.cpp
index 5a6297b8..76c6414d 100644
--- a/src/app/Knob.cpp
+++ b/src/app/Knob.cpp
@@ -1,5 +1,7 @@
 #include "app.hpp"
 #include "gui.hpp"
+// For GLFW_KEY_LEFT_CONTROL, etc.
+#include <GLFW/glfw3.h>
 
 
 namespace rack {
@@ -12,6 +14,9 @@ void Knob::onDragStart() {
 }
 
 void Knob::onDragMove(Vec mouseRel) {
+	// Drag slower if Ctrl is held
+	if (guiIsKeyPressed(GLFW_KEY_LEFT_CONTROL) || guiIsKeyPressed(GLFW_KEY_RIGHT_CONTROL))
+		mouseRel = mouseRel.mult(0.1);
 	setValue(value - KNOB_SENSITIVITY * (maxValue - minValue) * mouseRel.y);
 }
 
diff --git a/src/app/SVGKnob.cpp b/src/app/SVGKnob.cpp
index 24790030..494b23ba 100644
--- a/src/app/SVGKnob.cpp
+++ b/src/app/SVGKnob.cpp
@@ -5,6 +5,8 @@ namespace rack {
 
 
 SVGKnob::SVGKnob() {
+	margin = 1;
+
 	tw = new TransformWidget();
 	setScene(tw);
 
@@ -44,7 +46,7 @@ void SVGKnob::draw(NVGcontext *vg) {
 		nvgRect(vg, -margin, -margin, box.size.x + 2*margin, box.size.y + 2*margin);
 		nvgFillColor(vg, nvgRGBAf(0.0, 0.0, 0.0, 0.25));
 		Vec c = box.size.div(2.0);
-		float radius = c.x - 1;
+		float radius = c.x;
 		NVGcolor icol = nvgRGBAf(0.0, 0.0, 0.0, 0.25);
 		NVGcolor ocol = nvgRGBAf(0.0, 0.0, 0.0, 0.0);
 		NVGpaint paint = nvgRadialGradient(vg, c.x, c.y + 1, radius, radius + 3, icol, ocol);
diff --git a/src/dsp.cpp b/src/dsp.cpp
index 80b0d5c7..8174e181 100644
--- a/src/dsp.cpp
+++ b/src/dsp.cpp
@@ -1,6 +1,10 @@
 #include "dsp.hpp"
 
 
+#define DR_WAV_IMPLEMENTATION
+#include "../ext/dr_libs/dr_wav.h"
+
+
 namespace rack {
 
 
diff --git a/src/gui.cpp b/src/gui.cpp
index 30782bf0..094157f0 100644
--- a/src/gui.cpp
+++ b/src/gui.cpp
@@ -79,19 +79,11 @@ void cursorPosCallback(GLFWwindow* window, double xpos, double ypos) {
 	Vec mouseRel = mousePos.minus(gMousePos);
 	gMousePos = mousePos;
 
-	bool locked = glfwGetInputMode(window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED;
-
 	// onMouseMove
 	Widget *hovered = gScene->onMouseMove(gMousePos, mouseRel);
 
 	if (gDraggedWidget) {
 		// onDragMove
-		// Drag slower if Ctrl is held
-		if (locked) {
-			bool ctrl = glfwGetKey(window, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS || glfwGetKey(window, GLFW_KEY_RIGHT_CONTROL) == GLFW_PRESS;
-			if (ctrl)
-				mouseRel = mouseRel.mult(0.1);
-		}
 		gDraggedWidget->onDragMove(mouseRel);
 
 		if (hovered != gDragHoveredWidget) {
@@ -272,6 +264,10 @@ void guiRun() {
 	}
 }
 
+bool guiIsKeyPressed(int key) {
+	return glfwGetKey(window, key) == GLFW_PRESS;
+}
+
 void guiCursorLock() {
 	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 }
diff --git a/src/widgets/FramebufferWidget.cpp b/src/widgets/FramebufferWidget.cpp
index 1c7691a6..2bbc8042 100644
--- a/src/widgets/FramebufferWidget.cpp
+++ b/src/widgets/FramebufferWidget.cpp
@@ -32,11 +32,6 @@ FramebufferWidget::~FramebufferWidget() {
 	delete internal;
 }
 
-/** A margin in pixels around the scene in the framebuffer
-This prevents cutting the rendered SVG off on the box edges.
-*/
-static const int margin = 1;
-
 void FramebufferWidget::step() {
 	if (!scene)
 		return;