Casio CZ/ VZ/ FZ - Pro Series

hi all,
i am a proud owner of a vz, which i have been using mostly as a midi 
controller....

i have this problem where i don;t know how to load some sounds that 
you guys have generously shared. 
im using winxp, with a presonus firebox- connected IN and OUT to the 
VZ1, and i've been trying to use vz editor and midiox with no 
success. i get the message "buffer full" on my vz screen when i try 
to send syx in midiox, 

and for vz editor i get an error from the program itself (after 
setting 3-02 correctly and the screen is flashing "executing"- io 
get the following mess "invalid paremeter was passed to a system 
function"

what am i doing wrong? or is my midi port faulty? i have 
successfully saved the default bank but can't load. i've been trying 
to search online but so far i've come up with nothing...

sorry if this quesation has already been asked, but thanks in 
advance!

also-what should  the value in menu3-04 for "cont no." be?

best regards