My struggles with Drum Maps have been legendary, but I am happy to say that I am no longer completely befuddled by them. While I still think they are unnecessarily complicated to set up and use, I at least figured out how to do it, and drum map/drum grid is now my favorite way to program beats.
Goal & background: I would also like to be able to do the PRV thing where you don't use the drum grid for editing but you still have your own custom names over on the left side. The fact that I'm