yes, you should be able to sync the virus to Cubase's tempo via midi clock.
It has been a while since I worked with this setting (and no longer have a virus c to confirm) but there is a setting on the virus to sync with your host software.
edit - just realized that I didn't fully answer your question.
I believe it was a two step process
1. adjust the setting in the virus to sync to external host
2. change setting in cubase to send sync signal
unfortunately I forget how to do all this now that I have a TI
