Has anyone come up with a summary of commands for the 404? Something to refer to quickly, maybe for when you're gigging and don't want the full manual?

Just checking before I bother to write up my own cheat sheet.

I don't have one, but the instruction manual's appendix has a quick reference sheet for all the commands, and also for MIDI implementation and a list that elaborates on the display messages. You could just photocopy that or get the PDF version and print out that page.