I don't own any of those combinations, but I do use the Korg Pa80 and the Yamaha Motif together. As far as midi compatability, there are some discrepancies in the default setups, but nothing so far that I've encountered that can't be worked out (so far anyway ), and it IS a blast using them together as well as in tandem with software sequencers including Cakewalk and XG works, which can play Yamaha styles files from within and be used to write songs ( midifiles ) by step entering chords and paterns ( or variations if you will ) from the styles.
The Motif is different from the Karma in that it doesn't use an "algorithim" method of making patterns. It uses recorded data, but I have software that does the "algorithim" thing pretty well, so for the home / studio setup it's a nice combo of stuff. I wonder if Steven Kay or Korg ever got around to putting a software version of "karma" out there for the PC. I know there had been talk of it before, but I never followed up on it. The karma had once piqued my interest, but I think for what I do, a dedicated board such as the Karma would have been overkill and funds spent that could have been better spent elsewhere for me. Now if the software was available at a reasonable price, I'd consider it.
Korg AJ
[This message has been edited by Bluezplayer (edited 04-06-2002).]
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AJ