The fundamental frequency is set in semitones. See Manual - Mutable Instruments Documentation
Right-click the “Frequency” knob and enter 48 (C4 = C0 + 48 semitones)
(samplerate does not matter)
The “Resonator” default is 30 (an octave + a tritone (= 6 semitones) lower)
- Ableton Live has middle C = C3 to add to the confusion.
- VCV uses scientific/ISO notation standard, where middle C = C4.
