The SYNC input applies hard-syncing to the waveforms by resetting the phase of the waveform when the sync signal passes upward through 0V. In fact, this is how to achieve 1V/octave tracking on VCO-2.Īt lower knob positions, a smaller adjustment can be made to the pitch, for subtle vibrato, for example. With the FM CV knob hard-right, the FM input functions similarly to the V/OCT input. The FM input applies an additional pitch adjustment with an included FM CV attenuator knob.
This is the standard used in all MIDI interfaces, quantizers, and some sequencers in VCV Rack. The V/OCT input tracks at 1V/octave, meaning that an increase of 1V increases the pitch by one octave, doubling the frequency. To control the pitch externally, use the V/OCT input (only on VCO-1) or the FM input. Like all parameters in Rack, you can right-click a knob to reset it to its initial position. In their initial states with FREQ and FINE at 12-o’clock positions, the note C 4 (middle C) is generated. In digital mode, the FREQ knob snaps to exact semitones in the chromatic scale. The pitch of each oscillator is controlled by the FREQ knob, with a range of 9 octaves, and the FINE knob (only on VCO-1), with an additional range of 2 semitones. In some cases, a digital sound is preferred, like FM synthesis for example, to emulate the classic 80’s FM style. In the DIG position, mathematically-perfect waveforms are generated instead. In most cases, like subtractive synthesis, analog waveforms are often preferred due to their imperfect and “more musical” harmonics.
With the ANLG/DIG switch in the ANLG position, analog-modeled waveforms are used. VCO-2 includes most of VCO-1’s features but allows morphing between these four waveforms. VCO-1 is a traditional analog/digital oscillator with four output waveforms: SIN (sine), TRI (triangle), SAW (sawtooth), and SQR (square). A voltage-controlled oscillator generates raw tones at a particular frequency controlled by a voltage signal.
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