Casio CZ/ VZ/ FZ - Pro Series

Howdee,

I don't have a manual, and I'm not succeeding at setting up a multi-
channel setup.
For starters, if I hit the Multi-Channel button, the display shows an 
internal sound, then POLY=0 is blinking.  If I put the cursor on the 
0, I can't change the value.  The Value slide doesn't change it, or 
any other key. So I don't hear that sound. Does it take a keystroke 
combination ?  The slide will change the channel or level, but not 
the poly. 

I can't get the cursor on the (OUT1) output field either.  If I put 
change my keyboard's midi channel, I can hear that someone has put a 
sound on a channel or two, but I can't do anything with it.

help!

Thanks,
Pete