This module is based on a famous mixer. As feedback modules tells us: Sound design channel strip based on a famous late seventies small mixer used by many electronic music bands. I like this one as it can overdrive drum sounds quite nicely. The chip it needs can be hard to find.
https://feedback-modules.myshopify.com/collections/modules/products/pre-km
YouTube review on Pre CR, KM and BX
Difficulty to build: Medium. Has a great build manual. Has multiple pcb’s, need a rare part HA1457