Hi Dieter

> Btw. we are still about to develop the A-100 frequency to cv converter.

GREAT!!!!!

> The
> most complicated part of the circuit is to create a clean (sine or triangle
> or rectangle) wave from any (or at least most) audio input signal.

I'd say: let it be the problem of the user. I played once with a kind of
prototype of - I think - Markus Aicher (I am not sure who it was
really): it was much easier to preprocess the signal with external
equipment.

Florian