Stytockf1.2 will convert any Yamaha style file to a Casio .ckf style file and it works pretty well for that, but I don't know how to convert from .ckf to .ac7 although my PX350 plays both .ac7 and .ckf styles np problem, I'm not sure if the WK does. If it does-I have just discovered this website which is actually for Yamaha PSR but check it out-   http://psrtutorial.com/MB/mixMaster.html   There are programs on this website to completely customize any Yamaha .sty file and I mean everything-loudn