Hi all. A bit late... I finally did this, and it worket. My portamento is working great again.
Thanks a lot Florian.
Jeppe
> This should be a faulty IC7 on the VCO board. Originally a
> HD14066BP, but you can take a CD4066B (or even a CD4016B which is pin
> compatible) without any problem.
> If you replace this chip, it might(!) be possible that you have to
> readjust the V/Octave setting