Here are Yamaha's and Korg's TOTL keyboards. It would be interesting to see what everybody thinks of the sound comparison of the Tyros 4 and PA3X side by side.

http://www.korgpa.com/en/products/arrangers/pa3x/pa3x-demo.html

http://www.youtube.com/user/TyrosYamaha

For the Tyros 4 you may want to scroll down to 60's Rising Pop as that's where the onboard styles and voices begin. Everything before that I believe is an add on style or voice.