Hello,
Can't believe I just found out about this place after 12 years of owning & loving my Virus(es)...
Anyway, I've created an advanced Virus controller for iPad using TouchOSC which allows things you could never do with knobs alone - I've come up with some insane stuff while experimenting with it.
You can read about it here:
http://www.whinecellarstudio.com/home/antidote.html
Hope it inspires you
EDIT: this controller was designed with a Virus Classic for backward compatibility but it's very easy to remap any controller for the newer TI models...