The Filters on the Virus are pretty standard. You can adjust the Envelope Amount of modulation for each of the two filters, which means exactly that: how much you want the Filter Cutoff to be modulated, either way (positive to the right of where it rests, negative to the left...).
I think you should probably try this with a "init patch" on your virus. Put the filter balance all the way to the left. And then play with just these settings so you get to know them well. Don't even change the CURVE of the envelope's attack, decay and release...
I don't mean to be rude here, but it shows you need to learn some basics
you have some dream machine to do that!
EDIT
the envelopes are fast enough to synthesize very hard hitting drums, or to modulate the filter for very precise and very fast psychedelic trance bass, even on 170+ beats per minute... so it's just a matter of knowing what you're doing, really...
try this, have a low pass filter, close the filter so the tone gets deep enough, then on the filter envelope, put this settings: no attack, a bit of decay, no sustain, and no or very short release, then slowly adjust the envelope amount knob, and play with it, or turn on the arp with "hold" setting enabled, the simple pattern 1 will do... play with it, the punch intensity brings more energy to the sound - so it's just another parameter to play with, for hard hitting sounds it's probably a good idea to turn in up, the other way around, just bring it down, that's it... if you want your waves to recycle on the same point (phase) for each note (which is really important for psychedelic trance bass and other similar sounds where you want it to play in a very stable fashion, adjust the "phase init" parameter, and you get all the precision you need.
Now, if you want it to wooble or sweep, turn the attack up, if you want it to rest on some cutoff point, turn the sustain up, the release is the time it takes to get back to the point where the cutoff knob rests. Play with it! Tweak that thing and open your ears! No problem with the envelopes or filters on the virus. Pretty much the same on any given synth out there (even software ones). Also try the negative polarity on the Filter Envelope. Try to turn down the "tracking of it", which just means that the Cutoff will vary it's position based on the note you press on the keyboard, useful for sounds that cover a larger scale on the keyboard. For examples: when you play low notes, the filter is very closed, when you go up an octave, it opens to allow more content to pass, so forth and so on. It let's you choose the root note for this as well...
Only after you get comfortable with all these settings, you should start experimenting with the two filters combo, either in serial, parallel or split modes.