Calibrate Controller Knobs, Mod Wheel, or Slider

1. Press Edit.
2. Select X1.
3. Select CAL and press Enter.
4. Select CCM and press Enter.
5. Sweep through the full range of the control you wish to calibrate.
6. Press Enter to store the calibration.
7. Press Home to finish.

Source: Xboard 25 — emu-xboard-25-49-61-manual-eng (manual)