Update examples, add vco.scd

examples/gain.scd

@@ -1,10 +1,11 @@
 // Simplest possible script using all variables, demonstrating buffering
-// by Brian Heim
+// by Andrew Belt
+// adapted for SC by Brian Heim
 
 ~vcv_frameDivider = 1;
 ~vcv_bufferSize = 32;
 
-~vcv_process = {|block|
+~vcv_process = { |block|
 	// Loop through each row
 	VcvPrototypeProcessBlock.numRows.do { |i|
 		// Get gain knob

examples/rainbow.scd

@@ -1,6 +1,6 @@
 // Rainbow RGB LED example
-// by Brian Heim
-// adapted from example by Andrew Belt
+// by Andrew Belt
+// adapted for SC by Brian Heim
 
 // Call process() every 256 audio samples
 ~vcv_frameDivider = 256;

examples/vco.scd

@@ -0,0 +1,37 @@
+// Voltage-controlled oscillator example
+// by Andrew Belt
+// adapted for SC by Brian Heim
+
+~vcv_frameDivider = 1;
+~vcv_bufferSize = 32;
+
+~phase = 0;
+~vcv_process = { |block|
+
+	var pitch, freq, deltaPhase;
+
+	// Knob ranges from -5 to 5 octaves
+	pitch = block.knobs[0] * 10 - 5;
+	// Input follows 1V/oct standard
+	// Take the first input's first buffer value
+	pitch = pitch + block.inputs[0][0];
+
+	// The relationship between 1V/oct pitch and frequency is `freq = 2^pitch`.
+	// Default frequency is middle C (C4) in Hz.
+	// https://vcvrack.com/manual/VoltageStandards.html#pitch-and-frequencies
+	freq = 261.6256 * pow(2, pitch);
+	postf("Freq: % Hz", freq);
+
+	deltaPhase = ~vcv_frameDivider * block.sampleTime * freq;
+
+	// Set all samples in output buffer
+	block.bufferSize.do { |i|
+		// Accumulate phase & wrap around range [0, 1]
+		~phase = (~phase + deltaPhase) % 1.0;
+
+		// Convert phase to sine output
+		block.outputs[0][i] = sin(2pi * ~phase) * 5;
+	};
+
+	block
+}