- Set controls as per Osc 1 procedure except: Osc 1 Level (Min), Osc 2 Level (Max).
- Center trimpots R51 (Range 2), R48 (Scale 2), R72 (Hi-End).
- Monitor audio at J5.
- Depress and hold low A. Adjust R51 for 55Hz.
- Depress and hold high A. Adjust R48 for 220Hz.
- Repeat steps 4-5 until perfect two octave spread is obtained.
- Change Octave switch to 8'.
- Depress and hold low A. Adjust R51 for 220Hz.
- Depress and hold high A. Adjust R72 for 880Hz.
- Repeat steps 8-9 until perfect two octave spread is obtained.
- Repeat steps 4-10 as required.
Source: Rogue — moog-rogue-service-manual (manual)