i'm sure that 2 pads are layered on each other @ 3:10, the one with 'trumpet' quality comes purely from smart use of filtering =) afaik there are quite a few similar patches already in the Virus from MS (manuel schleis, one half of denga & manus, vengeance, volition). try MS pads first then read what the others say
I can't describe it technically
again, it's only the filter on hypersaw and harmonically tuned osc's I think.
play till you get it