Casio CZ/ VZ/ FZ - Pro Series

Hey, I just got my shiny new (old) CZ5000 and I'm a little confused
about one feature that I'm pretty excited about.  Anyone with a 5000
or a 3000 should be able to help me.  
In MIDI "m. mode", how do I set the individual track's voices from the
front panel? It seems that I can change them individually on my
sequencer, or all at once from the panel.  It would be really nice if
I could set up all 8 voices right from the machine.  I read that "drum
machine" article in the files section, but those directions don't seem
to work on the 5000.  Thanks for your time!