Casio CZ/ VZ/ FZ - Pro Series

Howdy,
 Tes, What you are dealing with here is classic subtractive synthesis. 
The difference is you have digitally generated waveforms. the osc. 
envelopes are just like the ones on a sequential multitrack for 
example. You can perform a patch where the osc. is not locked to the 
key you play, but will start there and react to the envelope you apply 
to it. Many single osc. synths use this to make up for the lack of 
extra oscillators. your basic programming chops are going to be 
similar to any 2 osc. synth, just different terminology and digital 
simulation of analog control. If only one could figure out a way to 
twist knobs to change parameters in real time instead of the 
clunky,"select prameter then push up/down a bunch of times to alter. 
It is crippling for real time sound exploring, but that's the way 
things were going back in those days.
Rig