Claude,
9000 pro styles don't need to be converted to sound good on the Tyros; all you have to do is to tweak a few volumes and maybe change the drum sets. On the other hand, to convert Roland styles you will need a software like Styleworks by EMC http://www.tastenshop.com/taste/
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.