Filter envelopes are basically for automatically sweeping the the filter cutoff the moment you press each key so you don't have to sweep it manually with the cutoff knob.
Envelope amount determines the intensity of each sweep, A,D,S, slope and R determine the slope/timing/direction the filter sweep follows and the little plus sign (polarity) determines whether you want to sweep it in the opposite direction i.e Decay sweeping from down to up instead of up to down.
Note it will only sweep it to the point the filter is set, for example if cutoff is set to half way and env amount is set to full, it will only sweep to half. If both cutoff and env amount are set to full then the filter envelope will have no affect.
You can also use the filter envelope to sweep other parameters like pitch by assigning them in the mod matrix.
Without going into to much detail I recommend you do read up on basic synthesis and possibly the manuals for the virus also.
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