VCO: Increase maximum frequency to around 21,000 Hz.

src/VCO.cpp

@@ -667,7 +667,7 @@ struct VCO : Module {
 		config(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS, NUM_LIGHTS);
 		configSwitch(LINEAR_PARAM, 0.f, 1.f, 0.f, "FM mode", {"1V/octave", "Linear"});
 		configSwitch(SYNC_PARAM, 0.f, 1.f, 1.f, "Sync mode", {"Soft", "Hard"});
-		configParam(FREQ_PARAM, -75.f, 75.f, 0.f, "Frequency", " Hz", dsp::FREQ_SEMITONE, dsp::FREQ_C4);
+		configParam(FREQ_PARAM, -76.f, 76.f, 0.f, "Frequency", " Hz", dsp::FREQ_SEMITONE, dsp::FREQ_C4);
 		configParam(FM_PARAM, -1.f, 1.f, 0.f, "Frequency modulation", "%", 0.f, 100.f);
 		getParamQuantity(FM_PARAM)->randomizeEnabled = false;
 		configParam(PW_PARAM, 0.01f, 0.99f, 0.5f, "Pulse width", "%", 0.f, 100.f);