Casio CZ/ VZ/ FZ - Pro Series

>Hi everyone, I'm kinda curious if it's possible to mod any of the
>more advanced cz synths in a way that their LFO modulates velocity.
>That should be possible my soldering a couple of wires and adding a
>switch, shouldn't it?

I don't think it's possible unless you want to spend a considerable amount 
of time reverse-engineering it.  And even then it's kind of doubtful that 
any real features could be added (well, I know that at least a couple 
CZ-101s have been circuit-bent, but I don't know the extent of these 
modifications)