The first stage is to set the internal power supply and reference drive current

1. Remove the jumper on JP100
2. If not already done, remove R102 and R103
3. Adjust P301 for -9.0V at TP1
4. Adjust P302 for +9.0V at TP2
5. Monitor TP4
6. Adjust P201 for a frequency of 880Hz. This is not a critical adjustment, it simply allows multiple VCO’s to be set to the same ‘initial operating’ conditions

The next stage is to calibrate the Volt/Octave response of the module

1. Fit jumper JP100
2. Set P101 fully clockwise
3. Apply a voltage of 0.0V to [LOG FM]
4. Adjust P100 for a frequency of 110Hz at TP4
5. Apply a voltage of 3.0V to [LOG FM]
6. Turn P101 2 turns anticlockwise
7. Repeat steps (3) to (5) until the frequency is around 850Hz
8. Apply a voltage of 0.0V to [LOG FM]
9. Adjust P100 for a frequency of 110Hz at TP4
10. Apply a voltage of 3.0V to [LOG FM]
11. Tweak P101 anticlockwise
12. Repeat steps (8) to (11) until the frequency is 880Hz

The last stage is to 'tune' the VCO so that it can be used with 1V/Octave controllers such as a MIDI-CV.

1. Fit R102 and R103
2. Set [FINE] and [COARSE] to their mid-position ‘0’
3. Apply a voltage of 0.0V to [LOG FM]
4. Adjust P100 for a frequency of ~261Hz.