Casio CZ/ VZ/ FZ - Pro Series

I have a Casio PG380 synth guitar and a VZ10M, which I use to program 
the PG's RAM card, for extra sounds. I only just recently got the RAM 
card, and it had sounds already on it. I've also only just recently got 
the VZ10m, so I don't know it very well. 

The problem is, is that when I play the guitar synth with the RAM card 
in it - I get all the normal sounds playing - 64 in all. Then when I go 
and put the RAM card in the VZ and select CARD, I can only hear about 8 
or so sounds in the whole card. Flipping through all the banks and 
numbers shows only about one or 2 sounds per A-H bank letter. 

I thought I read somewhere that sometimes the VZ can set some parameter 
to "0" or something like that, and effectively the patch is there but 
isn't outputting. Also, the sounds sound different somewhat in the 
guitar (full, and like they're supposed to sound) whereas in the VZ, it 
sounds like some oscillators aren't switched on for that patch (all of 
the INTERNAL sounds in the VZ are fine). 

I'll try saving some internal sounds to the card and see if they can be 
heard when played from the card. The trouble is, there are sounds on 
the card that I want, so I don't want to overwrite the card, just to 
get it to initialise, if this is the problem. Just to reiterate, the 
card works fine in the guitar.

Any ideas?

Cheers, graham