I'd like to add a comment about DSI's handling of midi on the Prophet 6.
I've used the Prophet 6 for about 6 months now. I also own a Moog Sub 37. What stands out to me is this:
Event though DSI (ie. Dave Smith) is the "father of midi", my experience is that the implementation of midi in the Prophet 6 is troublesome at best. In contrast, the midi in my Sub 37 just works. Now, DSI might tell you they follow the specs more closely... As a user, this doesn't mean a whole lot to me. That's technical implementation details, that I, as a user, don't need to know/care about. I really wish the Prophet 6 had the same kind of no frills midi as the Sub 37.
I'll give you an example. When trying to sync the Prophet 6 sequencer to the tempo of my DAW, a couple of times it works correctly, the sequence in the Prophet 6 syncs, but after using this setup 4-5 times, it stops working. The only thing that would cure this, is to turn the Prophet 6 off and then on again. Then it would work 4-5 times again. Suspecting it might be a midi loop problem, I turned local off. Now the sync works all the time. However I now have no (and I mean no!) control over the synth. So the sequencer sync works, but nothing else does. I can't even change programs. Now, before you tell me local off is supposed to work that way, I'm already aware. That's not the point of my story. I have several other experiences, pointing in the same direction. On my Sub 37 it just works, the implementation is helpful and keeps out of your way, on the Prophet 6 it's not.