> I' ve got a question about transposing sequences with my Doepfer Mini
> Basis system. The sequencer A-155 with one multiple A-180 is also in
> the system.
>
> I'd like to add the pitch CV from the sequencer A-155 to the pitch CV
> from the keyboard (via MIDI-to-CV-module A-190), so I could transpose
> the sequence melodie with my MIDI keyboard.
>
> First I used the A-180 multiple to add CV from A-155 to that from
> A-190 and connect the summ of both to the CV-in of the oscillator. The
> result was a not understandable sequence of similiar tones - no
> sequence with the pitch I wanted. The CVs were not added in that way
> I'd like to.
>
> Then I add the both pitch CVs (A-155, A-190) with the A-138 mixer, the
> mixer's out connected to the CV-in of the oscillator - now it worked!
> The pitch of the sequence line could be transposed using the keyboard.
> So I decided that the A-180 must do something that cannot work
> especially with this both CVs (A-155, A-190).
>
> Question: what is the reason of the behaviour of the A-180 multiple
> module Is it possible to do some DIY-modification on the A-180 to use
> the multiple especially with A-155 and A-190

In principle an A-180 cannot do this job as you never should short outputs
(but that's what you do if you connect the CV out of an A-190 and A-155). In
the A-100 nothing can be damaged by shortening outputs but it's a basic
principle not to do that.
For your application you need a mixer/adder. But the VCOs also have a second
CV input available for this application (one via bus from the A-190 and one
in front from the A-155).

Best wishes
Dieter Doepfer