> hello dieter,
> ok, poll coming very soon!
> but, how will this passive mixer be connected to the
> a138a/b will it need soldering to the a138a/b's pcb
> or, externaly with a patchcable to one of the a138a/b
> inputs
> best regards,
> Bakis.

It will be necessary to solder 2 wires to the existing A-138a/b.

I also think about to pick up Florians idea concerning a crossfade mixer.
I'm not yet sure if it will be realized as a expansion module for an
existing mixer A-138a/b or as a new module (A-138d ). And we have to try
different circuits to find out the control behaviour (i.e. the crossfade
characteristics/response).

Thank you
Dieter Doepfer