The WK7500 manual is available here:

http://support.casio.com/manualfile.php?rgn=1&cid=008011141

It appears the styles have only two variations...that's not good.

Nice to see that slash chords are available.

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