While this is clearly a question for the DSI forums and people who know the Prophet, you might find some help here anyway (doesn’t hurt to ask). However, at the risk of not helping at all, the answer in these types of situations is usually one of two: 1) read the manual more. You’ll find some tiny little detail, some MIDI messsage that you need to send to say “execute.” 2) Try random sh*t. I have no particular suggestions to try, but sending a prog change or anything could seal the deal and get the changes to “take.” That said, this is a pretty weird thing, and no doubt it’s by design.
Isn’t there a Prophet 12 layout for MD somewhere here?
Thanks!