-1 on getting rid of Maths, it's a superb module and opens up so much modulation possibility (and also has some dang snappy envelopes). And rather than a Marbles I'd suggest getting something like Divkid's RND Step which gives you a bunch of sample and holds with internal random sources. Throw in a couple ring modulators, let's say Intellijel's Amps module, and you have many of the foundational pieces that make modulation possible and fun, which after all is the point of modular!

Just my 2 cents.