I think 64 poly might be an issue within an arranger...the style itself would use up a fair amount of poly, plus you have left hand and right hand sounds...and, if you layer sounds, you use up more.

64 note poly would be acceptable on a digital piano, I'm just not sure how well it would work on an arranger.

In any case, I doubt if we'll see an arranger from Kurzweil in the near future.

Ian