Casio CZ/ VZ/ FZ - Pro Series

Don't even bother to answer my last post, unless you're responding to
the autobiographical portion.  I did a search for CZ-1 manual through
the posts (which should've been the first thing I did) and immediately
turned up a casio manual site.  

SO, to start a bit better of a topic, perhaps, what features do you
all find to produce the most interesting sounds in the CZ-series
synths? I'm sure they must differ some, but there is probably some
uniting features that give them their own unique and desireable
timbres.  If this has already been hashed out, I guess I'll go back
and read a bit more before writing, but I figured this might spark an
interesting discussion.

--Austin.