Forgetting utilities, modulation sources, etc. is a very common mistake at the beginning. When we think about our dream house, we are mainly focused on the living room, the bedrooms, the kitchen, the bathroom... Corridors, doors, staircases and closets are less of a dream.

I can only recommend here modules that I use and appreciate:
Buff Mult (buffered multiple), A-180-2 (passive multiple), Sinc Defero (buffered quad attenuator), A-160-2 (clock/trigger divider), A-151 (sequential switch), CalTrans (calibrator and transposer), Booster Stage (amplifier to eurorack systems), Mutes (multi channel mute), Disting mk4 (multifunction module), Listen IO (input/output interface)...

'On ne devrait jamais quitter Montauban' (Fernand Naudin).
https://soundcloud.com/petrus-major/tracks