Casio CZ/ VZ/ FZ - Pro Series

The 'effects' is really only a Chorus. A very nice chorus I think, 
but still only a chorus. Unfortunately it affects all voices at the 
same time.

The only Z-series instrument that has filters are the FZ's. The CZ 
and VZ series have phase distortion envelopes that can sound very 
much like analogue filters, but they are still not filters.

The CZ 5000 differs from the CZ 1000 in that it's got an onboard 
sequencer, a 5 octave keyboard, keyboard split and keyboard layer 
functions. It also doubles the polyphony.

In short, the CZ 5000 is allmost the same synthesizer as the CZ 1000, 
but a more powerful synthesis engine due to it's layering 
capabilities, and it's a better keyboard, especially for live use.