Maths is not a VCA, and for a tiny system like this, it's probably not what you want. You only have 22 hp left in the case.

I'd suggest spending that 22hp on a quad function generator such as Zadar, Stages, or Quadrax. They'll give you tons of flexibility, and can even act as sound sources if you like. Those modules range from 10-14hp, so you'd have either 8 or 12 hp left. With that space, add a VCA module. Plenty of options... a dual VCA like the 6hp Intellijel VCA would be good. That would leave you a few more hp for something else, and I'd suggest a Disting mk 4 (because it does basically everything).