- Press the Controllers button to enter the Controllers menu.
- Use the Down cursor button to scroll to the last page (Calibrate Controllers).
- Press the Enter button.
- Press the Real-time Controller knobs you wish to calibrate to select them.
- Move the knobs fully clockwise and counter-clockwise.
- Press the Enter button to store the calibration settings.
Source: Vintage Keys VK-6 keyboard — pk-6reve (manual)