Thanks, Ronin1973. The M32 does have a noise source in addition to the one VCO, but the 1U module you mention looks like it has a lot more than just noise to offer. Also, thanks for the recommendation on the Mimitec Digitalis. I'm definitely going to eventually want a dedicated sequencer module that's more intuitive to use on the fly than the M32's sequencer.
I definitely plan to take it very slow as I have a lot to learn about these modules before understanding where to go next, but I've seen enough warnings on this site and others to know that is easier said than done.