Pam's does Euclidean, but in a more set-and-forget way, so if you want playability, Euclidean Circles is a reasonable combo with Quad Drum / Qex. But it does take up space. You might think about the other wide modules here (Morphagene, Qpas, Maths) and consider alternatives. There's also a fair amount of overlap among O_c, CVilization, øchd, Sloths, and Wogglebug. It's not so much that one can be covered by the others, but that there's a lot of similar kinds of modulation here and not much to modulate. Jim has good advice on thinking about voices and their paths through a possible system. Try not to fill the case more than 3/4 full in any potential plan, to leave room for discovery and expansion.