SONOFA!!!
i just made a REALLY LONG reply and got logged out before i was done and it got eaten when i logged back in! i hate that!!!
i guess it's lucky for you as you won't have to read me rambling on and taking 100 tangents, so i'll just summarize...
maths & similar rampage are VERY popular, powerful & handy. they're just too complicated for ME to be able to understand as they "HIDE" their features below the surface and expect you to be able to remember the 1,001 things a single jack can do. it gave me a headache watching a rampage demo where the OP just kept plugging & unplugging stuff constantly, naming the "new functions" and for all practical purposes might as well have been speaking chinese. i'm a "one thing at a time" thinker & have to understand each thing before going to the next one. i get lost trying to understand maths. besides, i have NO INTEREST in making big complicated patches. i see a MY imaginary modular as one big synthesizer that i can swap & stack oscillators & filters with, hence the name "tone bender" while sticking to the basic MIDI/control > clock > LFO > voltage control > VCO > VCF > ADSR > effects > mixer > VCA signal chain.
in this summary, i'll use that to jump to the topic of planning and start at what was the end... don't forget the site's rack planner. i use it to TRY and organize rack rows by that basic concept from top to bottom & left to right until aesthetics get in the way and i group modules by maker or just HAVE TO put the Z3000 smart filter in the center because all of that black trim bothers me when it's asymmetrical. DON'T get me started on mismatching all black modules... i need a row dedicated to just them to be happy. besides, the rack is imaginary, so looking at it is all i can do with it.
before that, i was talking about writing things down, agreeing with you. it really helps keep track of things. i keep TWO lists, one is a module by module list of each row in the rack including basic functions with a second list that breaks everything down by FUNCTION: control, CV, MIDI, clock, osc, filter, envelope, LFO, VCA, mixer, effect etc. so i can keep track that all bases are covered as well as where functions overlap when so many modules do so many things. i tend to overlook utilities as they aren't as fun as oscillators, filters & effects, and in the case of maths, in particular, as easy to understand.
if you have a rack, you can "cheat polyphony" by just multitracking your chords. you can't do it live, but you can do it with a DAW. let's ay all you're doing is an A/C/E chord. just record one pass of all you As, another for your Cs and another for your Es. now your mono is poly and it only cost you TIME, and all of your voices are perfectly synced. me? i'd take that one step further and record each note in stereo (binaurally) playing through a speaker, then move the speaker for each new pass so when you listen on headphones, the chords get spread out like a chorus. it'd also require 3x the channels... 3 channels for the direct sounds, plus another 2 each for stereo, but hey, that's what DAWs are for, right? they ALSO make life simple letting you sequence and fine tune modulations while ALSO making them complicated making you learn how to use them... again, with HIDDEN features, like maths & rampage... ARRRRGH! they CAN be learned though.
finally, back to your sequencer & drums, don't forget that you can use your modular to process audio in so many filtered & distorted ways! i think i'd use envelope following A LOT, human beatboxing triggers & envelopes instead of letting some heartless perfect timing (analogue) sequencer do it for me. you can fit an entire warehouse full of FREEWATRE synthesizers along with an entire recording studio in your DAW sequencer as VSTs, but digital will never sound as good as analogue, especially with synths & compressors. you could do all of your polyphonic stuff with VSTs (and even some freeware ones sound pretty good!) and then fatten them up externally with filters and TUBES. that's why my "tone bender" play rack has a metsonix tube VCA... for thickening samples, digital VCOs & the morpheus digital VCF (sick filter BTW!!!) and VSTs. tubes are great for warming digital up.
well... this reply is kind of long too, but i think i did MORE babbling last time. this time though, i'm copying & saving the text because i do not want to do this a third time, like turning your rack into a chord monster.
OK... this reply is a lot shorter and one more point... just because i hate maths & rampage doesn't mean you have to. there's a reason they're both so popular, but TYPICAL modular peeps LIVE to plug shee into other shee. not me. i just want a synthesizer that can make as many different sounds as possible along with mangle audio in as many ways as possible without sounding digital. otherwise, i'd do EVERYTHING in VSTs and save $9,000+ in imaginary money. LOL