Hi Hans,so sorry to hear that. you did cut the style down to 1 intro , 1 ending, 2 variations, 2 fills, that’s the way I read it in the manual. The only way to tell for sure would be to get an original style from him, turn it into a .mid and view the markers in a pc sequencer like xg works.
It’s probably a lot more work than you would have anticipated. Sadly.
Even changing the voices in mega voice tracks, you’d have squeaks and thumps etc unless it was put thru the mega voice cleaner, it removes those weird sounds. Also the likely hood of your drum and percussion tracks working 100% is negligible unless the drum kits used are also kits in his keyboard.
I spent years play around with ways of converting psr styles across to my Korg keyboards. It was easier to buy a psr, but , it was my hobby and I enjoyed doing it. Getting a complex style like the sx900 and dumbing it down to work on a less sophisticated keyboard is harder than vice versa.