VCO

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The voltage-controlled oscillator (VCO) is a typical analog audio oscillator with 1V/Oct pitch tracking for musical purposes. VCOs are one of the most basic audio sources in a synthesizer. Their sound is usually further shaped and refined by filters, wavefolders, voltage-controlled amplifiers (VCAs) and other audio effects.

Module power consumption: 16 mA

Inputs

• CV1 - control voltage input for pitch frequency (1V/Oct)
• CV2 - another control voltage input for pitch frequency (1V/Oct)
• MOD - control voltage input for modulating either frequency or the square wave's pulse width
• PW - dedicated pulse width modulation control voltage input
• SYNC - resets the waveform when a trigger signal is received

Outputs

• 2x RAMP - ramp/sawtooth wave output
• 2x TRI - triangle wave output, quieter than the other outputs so it might need amplification via the 2SIGNALAMP module for example
• 2x SQUARE - square wave output
• BUS CV - pitch control voltage form the MASTER I/O module's MIDI-CV converter

Controls

• MOD DEPTH Potentiometer - attenuator for the MOD input control voltage
• MOD DEPTH Switch - switches the MOD control voltage target between frequency and pulse width
• COARSE - coarse tuning of the VCO frequency
• FINE - fine tuning of the VCO frequency
• PULSEWIDTH - manual control over the square wave's pulse width, control voltage modulation is added to this potentiometer setting

Patch Suggestions

This video by Synths & Things explains the ins and outs of this module really well: https://youtu.be/vBKg-7lSAus

This video by The Tuesday Night Machines demonstrates frequency modulation sounds: https://www.youtube.com/watch?v=jVtANkhEBGY