Casio CZ/ VZ/ FZ - Pro Series

hi there, i am really glad i found this place, after trawling the web 
finding little bits of info on the cz series i think i have found 
somewhere useful. i just got a cz3000 the other day and am figuring 
out how to use it. i have been using soundlib patch editor with it. i 
am using about half of the memory spaces on the cz3000 with the rest 
left free but when i send sysex files from soundlib to the cz i get a 
"memory full!" error message even though there are spaces on the 
memory a bank number (usually D4) will flash alternately with the 
error message. if anyone could let me know how the memory banks work 
that would be great, for example, if i have my patches stored in the 
memory and then send sysex patches fromt the pc will it overwrite my 
own patches? and is there a way to clear the memory or designate which  
banks sysex patches will be sent to?
i am really impressed with this machine, even tho i have only spent a 
day with it i can't wait to get into its guts and make the sounds i 
know it is capable of.
any help is much appreciated.
thanks in advance
alistair