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OS v6+ for Virus C should give you additional new arpeggiator patterns (>64), 1-6 pole analog (Moog style) emulated resonant multimode filters, and PureTuning, if I remember. The latter is great in cases when playing chords with heavy distortion - gets rid of the usual, discordant beating of frequencies that you would normally get - sounds really... pure. However it can sound overly surgical (digital and cold) for other purposes as it also eliminates the warm analogue-esque frequency instabilities that are programmed into the usual Virus' oscillators. Shame PureTuning isn't available on a per-patch level, rather than a global one.
Anyway, that's Timo's top tip for today, hehe.
Actually, I remember the Winter NAMM show that Ben Crosland demo'd the new filters on the then new OS v6.5 all the way back in 2004. The 1-pole analog filter is truly evil. Uploaded it for posterity. Sorry for the quality (source video was really lo-fi to begin with, RealPlayer, remember them? ha).