Yes, the new 3500/3000 and newer 3700/3200's are much better (IMO). You can take a midi file, and with some work...change it into a rhythm. The advanced tones are very good, and the organ section has some great features. Check out our other Casio forum, for mp3 files posted by users.
http://www.originalz.com/casio/casio_bbs/