> Yes, my mistake, 138c is linear. I had a quick look and it is very
> easy to put a jumper on it and then to get the offset function.
> I'm pretty sure there was no jumper on it when I purchased it, dunno
> why...
>
> By the way, I searched on the Doepfer website and didn't see any
> information regarding those jumpers (wanted to know the length between
> the too things, I guess it's 2.5mm). Maybe I missed it, but if there
> isn't any, that would be cool to mention it somewhere with a little
> 'how to' for noobs like me !
>
> Cheers,
> Max.

The pin header used for the jumper is mentioned on page 4 of the user's
manual. A standard 1/10" (2.54mm) jumper has to be used.

Best wishes
Dieter Doepfer