Thanks for answering. There was a possibility to get a Virus XL very cheap, but that's sorted out. The unit went to someone else. No problem for me, because, as Dunkel says, there's no really need to get a second virus. First I was thinking about to get the C-features to control them with the B's knobs, but after all it hasn't got that much advantages over the B.
But it's true, there is a picture to download on the access website showing the preprogrammed CC-numbers of all the knobs on the B's surface. So it actually can be used as a controller for other units.
For those, who might be interested: the direct link doesn't work, so follow the link below, go to support, then to virus b, then scroll down all the way to the bottom of site. There you'll find an item called 'Picture of the B series knob/controller assignments' :
http://www.access-music.de/downloads...product=virusb