Nice skill, Garfield,
I am not quite that handy in building cables. Anyways, using A4 with modular is way easier than Octatrack as you just need to configure the CV A-D settings on the CV menu from A4 and off you go. Octatrack is more of a pain as need MIDI to CV like cv.ocd and do lots of tweaking. I love using drums with A4/OT since I don't need to spend 10-20k on a large modular bass/drum setup.
Still, I like the experimental percussion modules like WMD Fracture/Chimera and Intellijel Plonk and will add those as well as Hexinverter Mutant Machine in the future to complement my Noise Engineering BIA module. Drums are just way too much fun and along with bass the heart of all dance and electronic music.