diff --git a/src/LFO.cpp b/src/LFO.cpp
index 4e23a7f..f68c540 100644
--- a/src/LFO.cpp
+++ b/src/LFO.cpp
@@ -131,18 +131,18 @@ struct LFO : Module {
 			// FM1, polyphonic
 			pitch += float_4::load(inputs[FM1_INPUT].getVoltages(c)) * fm1Param;
 			// FM2, polyphonic or monophonic
-			if (inputs[FM2_INPUT].getChannels() == 1)
-				pitch += inputs[FM2_INPUT].getVoltage() * fm2Param;
-			else
+			if (inputs[FM2_INPUT].isPolyphonic())
 				pitch += float_4::load(inputs[FM2_INPUT].getVoltages(c)) * fm2Param;
+			else
+				pitch += inputs[FM2_INPUT].getVoltage() * fm2Param;
 			oscillator->setPitch(pitch);
 
 			// Pulse width
 			float_4 pw = pwParam;
-			if (inputs[PW_INPUT].getChannels() == 1)
-				pw += inputs[PW_INPUT].getVoltage() / 10.f * pwmParam;
-			else
+			if (inputs[PW_INPUT].isPolyphonic())
 				pw += float_4::load(inputs[PW_INPUT].getVoltages(c)) / 10.f * pwmParam;
+			else
+				pw += inputs[PW_INPUT].getVoltage() / 10.f * pwmParam;
 			oscillator->setPulseWidth(pw);
 
 			// Settings
@@ -284,10 +284,10 @@ struct LFO2 : Module {
 			// Wave
 			float_4 wave = waveParam;
 			inputs[WAVE_INPUT].getVoltage();
-			if (inputs[WAVE_INPUT].getChannels() == 1)
-				wave += inputs[WAVE_INPUT].getVoltage() / 10.f * 3.f;
-			else
+			if (inputs[WAVE_INPUT].isPolyphonic())
 				wave += float_4::load(inputs[WAVE_INPUT].getVoltages(c)) / 10.f * 3.f;
+			else
+				wave += inputs[WAVE_INPUT].getVoltage() / 10.f * 3.f;
 			wave = clamp(wave, 0.f, 3.f);
 
 			// Settings
diff --git a/src/Merge.cpp b/src/Merge.cpp
index 25ec173..a8ba7d1 100644
--- a/src/Merge.cpp
+++ b/src/Merge.cpp
@@ -42,7 +42,8 @@ struct Merge : Module {
 			outputs[POLY_OUTPUT].setVoltage(v, c);
 		}
 
-		outputs[POLY_OUTPUT].setChannels((channels >= 0) ? channels : (lastChannel + 1));
+		// In order to allow 0 channels, modify channels directly instead of using `setChannels()`
+		outputs[POLY_OUTPUT].channels = (channels >= 0) ? channels : (lastChannel + 1);
 
 		// Set channel lights infrequently
 		if (lightDivider.process()) {
diff --git a/src/Scope.cpp b/src/Scope.cpp
index f34e860..f43d189 100644
--- a/src/Scope.cpp
+++ b/src/Scope.cpp
@@ -85,13 +85,13 @@ struct Scope : Module {
 		int frameCount = (int) std::ceil(deltaTime * args.sampleRate);
 
 		// Set channels
-		int channelsX = inputs[X_INPUT].isConnected() ? inputs[X_INPUT].getChannels() : 0;
+		int channelsX = inputs[X_INPUT].getChannels();
 		if (channelsX != this->channelsX) {
 			std::memset(bufferX, 0, sizeof(bufferX));
 			this->channelsX = channelsX;
 		}
 
-		int channelsY = inputs[Y_INPUT].isConnected() ? inputs[Y_INPUT].getChannels() : 0;
+		int channelsY = inputs[Y_INPUT].getChannels();
 		if (channelsY != this->channelsY) {
 			std::memset(bufferY, 0, sizeof(bufferY));
 			this->channelsY = channelsY;
diff --git a/src/Split.cpp b/src/Split.cpp
index 88352ab..3d22c66 100644
--- a/src/Split.cpp
+++ b/src/Split.cpp
@@ -28,7 +28,7 @@ struct Split : Module {
 	void process(const ProcessArgs &args) override {
 		for (int c = 0; c < 16; c++) {
 			float v = inputs[POLY_INPUT].getVoltage(c);
-			// To allow users to debug buggy modules, don't assume that undefined channels are 0V.
+			// To allow users to debug buggy modules, don't assume that undefined channel voltages are 0V.
 			outputs[MONO_OUTPUTS + c].setVoltage(v);
 		}
 
diff --git a/src/VCA.cpp b/src/VCA.cpp
index 8c37f10..5ea6dd9 100644
--- a/src/VCA.cpp
+++ b/src/VCA.cpp
@@ -29,9 +29,6 @@ struct VCA : Module {
 	}
 
 	void processChannel(Input &in, Param &level, Input &lin, Input &exp, Output &out) {
-		if (!in.isConnected() || !out.isConnected())
-			return;
-
 		// Get input
 		int channels = in.getChannels();
 		simd::float_4 v[4];
@@ -47,17 +44,17 @@ struct VCA : Module {
 
 		// Apply linear CV gain
 		if (lin.isConnected()) {
-			if (lin.getChannels() == 1) {
-				float cv = lin.getVoltage() / 10.f;
-				cv = clamp(cv, 0.f, 1.f);
+			if (lin.isPolyphonic()) {
 				for (int c = 0; c < channels; c += 4) {
+					simd::float_4 cv = simd::float_4::load(lin.getVoltages(c)) / 10.f;
+					cv = clamp(cv, 0.f, 1.f);
 					v[c / 4] *= cv;
 				}
 			}
 			else {
+				float cv = lin.getVoltage() / 10.f;
+				cv = clamp(cv, 0.f, 1.f);
 				for (int c = 0; c < channels; c += 4) {
-					simd::float_4 cv = simd::float_4::load(lin.getVoltages(c)) / 10.f;
-					cv = clamp(cv, 0.f, 1.f);
 					v[c / 4] *= cv;
 				}
 			}
@@ -66,19 +63,19 @@ struct VCA : Module {
 		// Apply exponential CV gain
 		const float expBase = 50.f;
 		if (exp.isConnected()) {
-			if (exp.getChannels() == 1) {
-				float cv = exp.getVoltage() / 10.f;
-				cv = clamp(cv, 0.f, 1.f);
-				cv = rescale(std::pow(expBase, cv), 1.f, expBase, 0.f, 1.f);
+			if (exp.isPolyphonic()) {
 				for (int c = 0; c < channels; c += 4) {
+					simd::float_4 cv = simd::float_4::load(exp.getVoltages(c)) / 10.f;
+					cv = clamp(cv, 0.f, 1.f);
+					cv = rescale(pow(expBase, cv), 1.f, expBase, 0.f, 1.f);
 					v[c / 4] *= cv;
 				}
 			}
 			else {
+				float cv = exp.getVoltage() / 10.f;
+				cv = clamp(cv, 0.f, 1.f);
+				cv = rescale(std::pow(expBase, cv), 1.f, expBase, 0.f, 1.f);
 				for (int c = 0; c < channels; c += 4) {
-					simd::float_4 cv = simd::float_4::load(exp.getVoltages(c)) / 10.f;
-					cv = clamp(cv, 0.f, 1.f);
-					cv = rescale(pow(expBase, cv), 1.f, expBase, 0.f, 1.f);
 					v[c / 4] *= cv;
 				}
 			}
diff --git a/src/VCF.cpp b/src/VCF.cpp
index fc3c903..5109284 100644
--- a/src/VCF.cpp
+++ b/src/VCF.cpp
@@ -128,12 +128,10 @@ struct VCF : Module {
 
 			// Drive gain
 			float_4 drive = driveParam;
-			if (inputs[DRIVE_INPUT].isConnected()) {
-				if (inputs[DRIVE_INPUT].isMonophonic())
-					drive += inputs[DRIVE_INPUT].getVoltage() / 10.f;
-				else
-					drive += float_4::load(inputs[DRIVE_INPUT].getVoltages(c)) / 10.f;
-			}
+			if (inputs[DRIVE_INPUT].isPolyphonic())
+				drive += float_4::load(inputs[DRIVE_INPUT].getVoltages(c)) / 10.f;
+			else
+				drive += inputs[DRIVE_INPUT].getVoltage() / 10.f;
 			drive = clamp(drive, 0.f, 1.f);
 			float_4 gain = simd::pow(1.f + drive, 5);
 			input *= gain;
@@ -143,23 +141,19 @@ struct VCF : Module {
 
 			// Set resonance
 			float_4 resonance = resParam;
-			if (inputs[RES_INPUT].isConnected()) {
-				if (inputs[RES_INPUT].isMonophonic())
-					resonance += inputs[RES_INPUT].getVoltage() / 10.f;
-				else
-					resonance += float_4::load(inputs[RES_INPUT].getVoltages(c)) / 10.f;
-			}
+			if (inputs[RES_INPUT].isPolyphonic())
+				resonance += float_4::load(inputs[RES_INPUT].getVoltages(c)) / 10.f;
+			else
+				resonance += inputs[RES_INPUT].getVoltage() / 10.f;
 			resonance = clamp(resonance, 0.f, 1.f);
 			filter->resonance = simd::pow(resonance, 2) * 10.f;
 
 			// Get pitch
 			float_4 pitch = 0.f;
-			if (inputs[FREQ_INPUT].isConnected()) {
-				if (inputs[FREQ_INPUT].isMonophonic())
-					pitch += inputs[FREQ_INPUT].getVoltage() * freqCvParam;
-				else
-					pitch += float_4::load(inputs[FREQ_INPUT].getVoltages(c)) * freqCvParam;
-			}
+			if (inputs[FREQ_INPUT].isPolyphonic())
+				pitch += float_4::load(inputs[FREQ_INPUT].getVoltages(c)) * freqCvParam;
+			else
+				pitch += inputs[FREQ_INPUT].getVoltage() * freqCvParam;
 			pitch += freqParam;
 			pitch += fineParam;
 			// Set cutoff
diff --git a/src/Viz.cpp b/src/Viz.cpp
index 0d459c0..21f6935 100644
--- a/src/Viz.cpp
+++ b/src/Viz.cpp
@@ -17,7 +17,7 @@ struct Viz : Module {
 		NUM_LIGHTS
 	};
 
-	int lastChannels = 0;
+	int lastChannel = 0;
 	dsp::ClockDivider lightDivider;
 
 	Viz() {
@@ -27,7 +27,7 @@ struct Viz : Module {
 
 	void process(const ProcessArgs &args) override {
 		if (lightDivider.process()) {
-			lastChannels = inputs[POLY_INPUT].getChannels();
+			lastChannel = inputs[POLY_INPUT].getChannels();
 			float deltaTime = args.sampleTime * lightDivider.getDivision();
 
 			for (int c = 0; c < 16; c++) {
@@ -58,7 +58,7 @@ struct VizDisplay : Widget {
 			nvgFontSize(args.vg, 11);
 			nvgTextLetterSpacing(args.vg, 0.0);
 			nvgTextAlign(args.vg, NVG_ALIGN_CENTER | NVG_ALIGN_BASELINE);
-			if (module && c < module->lastChannels)
+			if (module && c < module->lastChannel)
 				nvgFillColor(args.vg, nvgRGB(255, 255, 255));
 			else
 				nvgFillColor(args.vg, nvgRGB(99, 99, 99));