> Hello Doepfer. I thought that I could tune without a midi module.
>
> Thank you,
>
> Sidney

A midi module is not essential but you need any CV source that generates
exact 1.00V steps to adjust the VCO scale. Another possibility would be a
CV/Gate keyboard or an A-176 with a precise multimeter (with the three
outputs adjusted e.g. to 1.00V, 2.00V and 5.00). In any case you have to
make sure that the CV source deliveres exact 1.00 intervals.

Best wishes
Dieter Doepfer