What genre of Roland and Korg styles are you looking for? I have a couple hundred in my archives that I'll be more than happy to send you.
P.S. All of the styles in my gig disks will also work in the tyros. You'll find them at www.psrtutorial.com
PSR-S950, Bose L1 Compact, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, Morgan 33 Out Island Sailboat, and lots of other silly stuff!