It’s pretty straight forward once you look through some of the Grid documentation:
I’ve done custom stuff for Digitone and Loopy Pro. I have 2x EF44, and EN16 and a PO16. I can post some code and instructions if you have an idea of what you’re looking to do.
It’s getting late here though and I’m super bagged from spin. Car’s in the shop tomorrow so I’m working from home. Give me an idea about what you’re looking for and I’ll see if I have time to script something up.