> I already have one, that I did install on a A-138b
>
> Now, I will have a second A-138x that I would like to install on
> the same A-138b.
>
> Do I ilstall it the same way at the same place Or do I install
> it on the A-138x

install the second A-138x in the same way as the first one.

Best wishes
Dieter Doepfer

P.S. The A-138x production has been stopped because of the poor sales (it
took more than 3 years to sell the first series).