This wont be hard to do but its illegal.
Simply record the midi tracks in example Cubase
then copy and fit everything in the style compiler.
make the right program changes and create the Audya style
hmmm, I think thatīs not that easy...
Donīt forget to remove Mega-, S.Art and S.Art2 Voices. Or better "replace" them with "normal" voices.
OK, this could be done with Jörgenīs "NoMegaInMIDI".
Then set the voices to GM or GM2 ( for instance with Heikoīs PSRUTI ).
After that extract the "Important" parts using CASM-Editor.
Now you can start editing the parts in sequencer
As alliehoe wrote before : Worst problem ist the COPYRIGHT !
Yamaha allows anybody to play / create songs using their styles ( in the german forum we got an official answer from Yamaha regarding this topic ). But Iīm sure that they donīt allow converting their styles to other machines ( from other manufacturers ...