For Tyros 1 &2, older PSR, CLP and DGX series (SFF1-Format) and
Tyros 3, 4 &5, newer PSR, CLP and DGX series (SFF2-Format)
With Style Works XT Yamaha you can convert any other keyboards' styles for your Yamaha instrument, edit styles on the PC and create song-related styles from standard midifiles.
Even conversion from one Yamaha instrument to another will give better results than simply loading a style made for (e.g.) PSR-9000 into a Tyros. Simply select the desired destination device, load the style and save it again. Doing so will e.g. remove the MegaVoices from a Tyros style and replace them with "normal" XG- or Preset- voices when saving for PSR-9000
A detailled description can be found here .