diff --git a/include/app/ModuleWidget.hpp b/include/app/ModuleWidget.hpp
index 9a81ad5d..b2865392 100644
--- a/include/app/ModuleWidget.hpp
+++ b/include/app/ModuleWidget.hpp
@@ -95,10 +95,10 @@ struct ModuleWidget : widget::OpaqueWidget {
 	*/
 	virtual void appendContextMenu(ui::Menu* menu) {}
 
-	PRIVATE math::Vec& dragOffset();
-	PRIVATE bool& dragEnabled();
-	PRIVATE math::Vec& oldPos();
-	PRIVATE engine::Module* releaseModule();
+	INTERNAL math::Vec& dragOffset();
+	INTERNAL bool& dragEnabled();
+	INTERNAL math::Vec& oldPos();
+	INTERNAL engine::Module* releaseModule();
 };
 
 
diff --git a/include/common.hpp b/include/common.hpp
index e98849cf..e187a42c 100644
--- a/include/common.hpp
+++ b/include/common.hpp
@@ -35,7 +35,7 @@ E.g.
 /** Attribute for private functions and symbols not intended to be used by plugins.
 By default this does nothing, but when #including rack.hpp, it prints a compile-time warning.
 */
-#define PRIVATE
+#define INTERNAL __attribute__((visibility("internal")))
 
 
 /** Concatenates two literals or two macros
diff --git a/include/engine/Engine.hpp b/include/engine/Engine.hpp
index 4e50dd25..2af1f846 100644
--- a/include/engine/Engine.hpp
+++ b/include/engine/Engine.hpp
@@ -28,7 +28,7 @@ struct Engine {
 	Write-locks.
 	*/
 	void clear();
-	PRIVATE void clear_NoLock();
+	INTERNAL void clear_NoLock();
 	/** Advances the engine by `frames` frames.
 	Only call this method from the primary module.
 	Read-locks. Also locks so only one stepBlock() can be called simultaneously or recursively.
@@ -48,7 +48,7 @@ struct Engine {
 	/** Sets the sample rate to step the modules.
 	Write-locks.
 	*/
-	PRIVATE void setSampleRate(float sampleRate);
+	INTERNAL void setSampleRate(float sampleRate);
 	/** Sets the sample rate if the sample rate in the settings is "Auto".
 	Write-locks.
 	*/
@@ -107,7 +107,7 @@ struct Engine {
 	Write-locks.
 	*/
 	void removeModule(Module* module);
-	PRIVATE void removeModule_NoLock(Module* module);
+	INTERNAL void removeModule_NoLock(Module* module);
 	/** Checks whether a Module is in the rack.
 	Read-locks.
 	*/
@@ -160,7 +160,7 @@ struct Engine {
 	Write-locks.
 	*/
 	void removeCable(Cable* cable);
-	PRIVATE void removeCable_NoLock(Cable* cable);
+	INTERNAL void removeCable_NoLock(Cable* cable);
 	/** Checks whether a Cable is in the rack.
 	Read-locks.
 	*/
@@ -190,7 +190,7 @@ struct Engine {
 	Write-locks.
 	*/
 	void removeParamHandle(ParamHandle* paramHandle);
-	PRIVATE void removeParamHandle_NoLock(ParamHandle* paramHandle);
+	INTERNAL void removeParamHandle_NoLock(ParamHandle* paramHandle);
 	/** Returns the unique ParamHandle for the given paramId
 	Read-locks.
 	*/
diff --git a/include/engine/Module.hpp b/include/engine/Module.hpp
index 63459bf5..cd95073f 100644
--- a/include/engine/Module.hpp
+++ b/include/engine/Module.hpp
@@ -345,11 +345,11 @@ struct Module {
 	virtual void onSampleRateChange() {}
 
 	bool isBypassed();
-	PRIVATE void setBypassed(bool bypassed);
-	PRIVATE const float* meterBuffer();
-	PRIVATE int meterLength();
-	PRIVATE int meterIndex();
-	PRIVATE void doProcess(const ProcessArgs& args);
+	INTERNAL void setBypassed(bool bypassed);
+	INTERNAL const float* meterBuffer();
+	INTERNAL int meterLength();
+	INTERNAL int meterIndex();
+	INTERNAL void doProcess(const ProcessArgs& args);
 };
 
 
diff --git a/include/rack.hpp b/include/rack.hpp
index 5c4d3215..601fd8c2 100644
--- a/include/rack.hpp
+++ b/include/rack.hpp
@@ -99,8 +99,8 @@
 #include <simd/functions.hpp>
 
 
-#undef PRIVATE
-#define PRIVATE __attribute__((error ("Using private function or symbol")))
+#undef INTERNAL
+#define INTERNAL __attribute__((visibility("internal"))) __attribute__((error ("Using function or symbol internal to Rack")))
 
 
 namespace rack {
diff --git a/src/core/AudioInterface.cpp b/src/core/AudioInterface.cpp
index 5e65a70d..608794a2 100644
--- a/src/core/AudioInterface.cpp
+++ b/src/core/AudioInterface.cpp
@@ -283,6 +283,7 @@ struct AudioInterface : Module, audio::Port {
 			// engine input -> audio output
 			dsp::Frame<NUM_AUDIO_OUTPUTS> outputAudioBuffer[frames];
 			int inputFrames = inputBuffer.size();
+			DEBUG("frames %d, inputFrames %d", frames, inputFrames);
 			int outputAudioFrames = frames;
 			inputSrc.process(inputBuffer.startData(), &inputFrames, outputAudioBuffer, &outputAudioFrames);
 			inputBuffer.startIncr(inputFrames);