32 polyphony is a major shortcoming on the WK's..
I also have a WK3000. When I play a sequence, and play over top of the sequence...the busier sequences force the Casio to stutter , slow down, and play eratic...The Casio does not handle allocation very well...but on the bright side, my older 32 poly PSR use to shut down when it reached the poly limit..at least the Casio keeps on going[human feel??].