Well My PA1-X lets you edit sounds particularly well.

Also the dual sequencing is something only it and the Audya (and the new Korgs) share - someone correct me if I'm wrong, I frequently am!

What I wish it would do is be as user friendly and as simple to operate as my old Roland VA-7 and the G-70 (and a few other G series I gather) - specifically, I wish it had the Make Up Tools of those boards.

I also wish it had semi-weighted or fully weighted keys!