Ribbon Centering Adjustment

1. Listen to the Oscillator.
2. Locate the hole in the bottom of the Micromoog under the left hand controller section (near VRIBBON CENTERING label).
3. Press and release the center bump of the ribbon.
4. Insert screwdriver and adjust the trimpot so the centering feels right (pitch does not change when finger is on the bump).

Source: Micromoog — 4cbaff59_Moog_MicroMoog_Manual (manual)