just as a matter of interest, out here there is a group called Rogue Traders and 80% of their sound is created by an Oasys...just thought i'd mention it..the band is a female lead singer, drummer and a keyboard player with the oasys and from what i hear in their music the karma tech is used a LOT, so i dont think its just stephen kay who can play with karma...granted it is a lot more hi tech and in depth with what you can tweak, arrange, setup etc etc, but it seems if you bother to learn it it would be very rewarding, more so imho, than the same style sounding exactly the same way for 90 bars...it is the subtle differences that make the biggest impact, once again just my own view.
cheers