I'm pretty sure the internal styles from the PSR-510 are available through some of the forums (the PSR-1700/2700 had similar styles), and the optional style disk library for those instruments is also around as well.

As far as I know they've been converted/adjusted for the newer instruments.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.