Hi Ilija
One nice thing about Yamaha is that the styles are really midi files. They can be created in Cakewalk or another sequencing program. One implication is that you can cut and paste parts from standard midi files. Since there are 100,000's available on the internet, they serve as a vast resource for creating Yamaha styles. Of course, the graphics are better on a computer than on an arranger display in that you can see more of what you are doing.
Clif