describe sidechain processing

Source/SynthVoice.cpp

@@ -187,6 +187,8 @@ void SynthVoice::renderNextBlock(juce::AudioBuffer<float>& outputBuffer, int sta
 	if (proc.globalParams.sidechainEnable->isOn()) { // just overwrite them
 		osc1CosineBuffer.copyFrom(0, 0, proc.sidechainSlice, 0, 0, numSamples);
 		osc1CosineBuffer.copyFrom(1, 0, proc.sidechainSlice, 1, 0, numSamples);
+		// taking sidechain as the vertical component, we calculate the horizontal component
+		// effectively mapping the sidechain to a semicircle
 		for (int i = 0; i < numSamples; i++) {
 			auto ls = std::clamp(osc1CosineBuffer.getSample(0, i), -1.f, 1.f);
 			auto rs = std::clamp(osc1CosineBuffer.getSample(1, i), -1.f, 1.f);
@@ -195,7 +197,6 @@ void SynthVoice::renderNextBlock(juce::AudioBuffer<float>& outputBuffer, int sta
 		}
 	}
 
-
 	osc2.processAdding(osc2Freq, osc2Params, osc2SineBuffer, osc2CosineBuffer);
 	osc3.processAdding(osc3Freq, osc3Params, osc3SineBuffer, osc3CosineBuffer);
 	osc4.processAdding(osc4Freq, osc4Params, osc4SineBuffer, osc4CosineBuffer);