Holy crap - that sounds to me like actual user feedback.
That's a rare and treasured thing. I do appreciate it.

1) I don't need money. My day job pays just fine. I've tried to "market" what I already got and have proven to myself that marketing is harder than writing code.

2) Writing a full fledged arranger might be hard. But doing something somewhat simpler isn't. PianoCheetah already has an ok way to enter chords in time. That plus style files plus arranger logic is pretty much working right now. It doesn't do live chord recognition, but it does a VERY simplified version of what band in a box does. Given some text chords with timestamps and some style files, weave an arrangement of midi. That's in development and a couple weeks from ready for the public. (If the public is interested).

3) So aren't these "chord events" or whatever recordable by your off the shelf midi sequencer? I guess it's time to hit google. But are these control change events? sysex events? It probably wouldn't be too difficult to do something along those lines. But it seems kind of geared for those arranger keyboards, not something I'd probably want in PianoCheetah per se.

So if you wouldn't mind pointing me to some specs for this "chord sequencer" you speak of, that would be great.

In the mean time, gotta go finish my mini band in a box-ISH thingy.