Karma? It's only existed in software form for some time now. You can get supplemental software for any of the Korg or Yamaha workstations, up to the Motif XF. When Yamaha introduced the Montage they changed the architecture enough that Stephen Kay has so far not released a compatible version for that board. Supposedly the Yamaha versions of Karma software have more features than the Korg versions. Mr. Kay was part of the arranger development team at Korg; I've been curious since it's debut about how close Karma gets to arranger functionality. Maybe someday I'll take the plunge with a compatible keyboard, and find out!