Point of fact... ANY arranger with a sampler.

PA1, PA2, T2, T3, Wersi OAS, Mediastation, probably forgotten a few more

The thing is, there's a big gap between capability and execution. Just as making a style is hard, finding JUST the right loops for a complete style is not easy. Then going through all the OS BS that doing this is going to be is also a major PITA.

But it's not a new capability by any means.