Ah..sorry no undo or undo history list.
I know how you feel though, doing design for ElectraX a while ago I managed to hit one of the pads on my LPD8 controller, of course I had it set to ' Program Change' and my carefully crafted FM pad sound went bye bye..argh
You learn and live though, whenever I design my LPD8 controller no longer lies in front of my controller keyboard