There are several programs available that can do this. Visual Styler is a program that allows you to convert styles from one PSR keyboard to another and also allows you to mix the variations of 2 different Yamaha styles as well as other light editing. It allows you to hear the styles as well. If I remember correctly I downloaded it from the egroups PSR styles site ( It's been awhile ). Also, any computer midi sequencer should allow you to listen to these styles ( at least the PSR styles anyway). Massiva is a freeware midi sequencer that's available on the shareware music machine. It's a pretty good program for freeware. I just tested a user style in it before responding to this post and it worked fine. You simply load the style as " all files" and it loads and plays. I also have Yamaha xg works software which plays and stores auto accomps.
Al M.