Hi again!
> Still planning my system, so I would welcome advice as to which module will take a midi signal and output several cv/gate signals to control say 4 VCO's eg in the Quad VCO's unit.
>
> Is this practical or should I budget for a polyponic cv keyboard
You could always do what I did, and wait patiently for someone to sell one of the wonderful MCV-24 units that are no longer in production. Or you could wait for the A-190-5 module to come out. Either should do the trick quite nicely!
http://www.doepfer.de/mcv24.htm
http://www.doepfer.de/a1905.htm
All the best,
Zoë.