> So doesn't matters if I split my VCO modules between lower and upper
> floor of a G6 case
>
> Thank you,
> Luca

It does not matter if the VCOs are in the same or in different rows. It is
essential if the same CV is used for all VCOs.
If you want to use an A-185 and the VCOs are in different rows (i.e.
different bus boards) you need a cable that connects the CV and Gate lines
of both bus boards (CV/Gate cable, available as spare part). The ends of
this cable are equipped with jumpers that are connected to the corresponding
pin headers of the two bus boards.

Best wishes
Dieter Doepfer