Like Uhi zebra or NI massive this would really take virus to the next level for me this would be ace!!!!!! Also would get a lot more use out of my virus with this.... 
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+1
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I agree, preferably the envelope(s) would be syncable like Zebra etc. and could have an arbitrary number of points rather than fixed ADSR.
A fully featured Multi-Stage Envelope section could replace or even be more versatile than extra LFOs, imo.