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, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)