Vintage Synth Repair

> I've started to look at that semi-tone issue. On Board A, pin 8 - cv out - I
> can see that the voltage shifts on release. So far I've traced it back as far
> as Q8, the 3958. I can drain the voltage from there. I ca't say that I'v
>found
> anything faulty yet. I'm looking into what inputs and outputs one should
> expect to find.

I would probably replace A1 (LM1458) first. I'm under the impression that
the quality of opamps has improved significantly. Some Odysseys I worked on
immediately got more stable after replacing the opamps in hte CV circuit.
One could even substitute it with one of the higher quality opamps; however
there might not be any significant improvements.