Hmmm, ok.

Thing is, I don't have an arranger keyboard. Any chance somebody could give me a midi recording of, say 3 chord changes?

This'd be a weird little extra program in the PianoCheetah install. I guess there'd just be an input device+channel picker, output device+channel picker, record and play buttons to start off with. When I get a midi recording I can see what the timer events look like and verify that it's just plain old notes and such that I send/receive.

Very eeeeeeeeeeeenterestin'