Casio CZ/ VZ/ FZ - Pro Series

are you starting from an initialized patch?

There shouldn't be clicks when notes start because the VZ restarts the 
phases of the waveforms when a voice is triggered.  But if you've got, say, 
a spike somewhere else in the envelope, or a hard attack with a slight 
delay, or an instant-off release, or something like that, then it can 
produce a click because the amplitude goes instantly up or down in the 
middle of the waveform cycle.

slowing the envelope down is the only way to get around clicking.  It 
doesn't mean the envelope has to be slow, just not *instant*.

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