Thread: Not enough VCA ?
Yeah, also getting all these sound sources out could be iffy, as I think you only have the ModDemix as a mixer.
In a system this size, I'm wondering whether Maths is the best use of HP real estate, as you could for almost the same HP get an Envelope generator (you do want one of those) and a micro quad VCA.
You also are going to need to power your rack, unless you have a built in power supply using no HP. Not sure why you would use a passive I/O module, but there are nice powered alternatives from Happy Nerding or 4ms.
See how this here resonates with you:
https://cdn.modulargrid.net/img/racks/modulargrid_841372.jpg
If you don't need the 4HP power, you could always throw a Disting MK4 in there.