Casio CZ/ VZ/ FZ - Pro Series

I just did a test.  There was a grounding problem hum on the PC audio 
when the CZ and PC were connected (MT red record to PC mic in).  
Neverless, I recorded an A/B digital audio dump, a C/D digital audio 
dump, and a sequencer digital audio dump.  All three verified OK.

Next, I changed an A/B preset and compared it with the digital audio 
dump from the PC.  There was a verify error.

So, I loaded back in the original A/B, got an OK on the load, 
reverified, and got an OK.

It would seem that despite the hum, it worked.

I used Sound Forge XP 4.5 for the test.

Opinion: If you have sysex capability for patch and sequencer dumps 
on a PC, I'd recommend that over digital audio dumps!   

Hope this helps