The Mode controls the polyphony of the Volca Keys. Monophonic modes are Unison, Octaves, Fifth and Unison Ring (Ring being a ring modulator); paraphonic modes are Poly and Poly Ring. Korg mislabels the synthesizer as polyphonic although all oscillators share the filter. The large Pitch knob controls the pitch register of the oscillators, using organ footage terminology. It spans six octaves and is switchable between 32′, 16′, 8′, 4′, 2′ and 1′. While in unison modes, the Detune control detunes the notes from the unison pitch up to a semitone, making the sound feel thicker. The Portamento control adds glide time between notes. Modulation can be applied to the oscillator pitch from the envelope generator using the EG Int control.
