There are styles here from the Tyros1 and 2 (and others)that work perfectly in the S900....see bottom of page.

http://psrtutorial.com/Files/PSR/PSRS900/Styles.html
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.