I never got round to building this, it's a programmable eurorack module that does lots of things such as LFO's, chord generation, random generator, arps etc. Full details here -
https://allensynthesis.co.uk/modules/europi.html
https://github.com/Allen-Synthesis/EuroPi
Includes pretty much everything you need to build it - chips, screen, Raspberry Pico Pi etc etc - you just need the resistors and capacitors.
Price includes postage