I've created INS files for the X500, There are separate INS files for instruments and drums. I've loaded this into Sonar and it appears to be working fine. These files can be edited in a text editor like TextPad to customize the instrument names to your liking or add new instruments in the USER sections.   EDIT: I've Posted a ZIP file with the INS files here.   Enjoy!   best regards, Rick Sterling        x500.zip