Dear group,

Having encountered the problem of just getting my VCO's to play C4 (261,6 Hz) with Tune (P1) almost on 10 I followed the instructions from the A-110 Service Manual:
Adjust the VCO Offset trimming potentiometer P6 so that the frequencies match to values of the table below while Tune (P1) is in middle position and all external CV's are zero.
Range Switch Position Frequency[Hz] Period[ms] Musical Value
-2 8.176 122.31 C3
-1 16.3515 61.156 C2
0 32.703 30.58 C1
1 65.406 15.29 C
2 130.813 7.645 c

Unfortunately I also managed to 'adjust' P8 (even twice) accidentally...
And that unfortunately starts to get noticeable from around G5 (783,9 Hz) on.
What is the best method to get the VCO back in tune

All advice is appreciated!

Kind regards,

Ton