I found the original expansion file to have 1024 sounds. I think if you re-do the procedure you will have all the factory sounds reset. The page is here:
http://www.innovativemusic.com.au/ac...ds_classic.htm
go to search that line: 1024 patches update for Virus c series
Another way (i think better) is to use soundDiver software which got all the sounds in memory. You can request soundDiver to the Virus support, they will send it to you in one day.
hope it helps.