There is also some technique to achieving DUg's sound as well, such as his use of a pick, fresh strings (I believe he uses DR High Beams .040-.100)
and low action (listen closely to most live clips and you'll hear a lot of fret buzz)
Oh, and slinging that bass way down around you knees
@JimmyM I was surprised not only at how well the VT does at copping the sound, but how well the overdrive responds to playing dynamics. With the drive at around 10 o'clock, I hear just a tad when playing lightly, but boy does it roar when I dig in hard. I find that when used together, the BBDI gives me the heavy deep scooped lows while the VT provides that gritty top end associated with DUg's tone.