I'm in agreement with Ronin here, actually. It might be a far better idea for you to get a copy of VCV Rack and start to explore these musical ideas in that environment, both to get some chops up as well as to get a clearer idea of what you'll actually need to accomplish this should you opt to work this out in hardware.
Fact is, there's a big "WARNING" sign in your initial post. Generative rigs that work really well tend to be larger setups, not the sort of thing you'd have in a Rackbrute 6U. While that initial module choice has nothing glaringly wrong with it, it's small enough that there's plenty of room for things to go that way as the design progresses. Since you have a clear musical direction in mind here, don't work it out in hardware, as you're apt to discover that you took a wrong turn a few purchases back and a $250 error in judgement will have turned into a $1250 one. Figure out how to get to where you want to go with ZERO expense first in order to avoid this.