Volume Swells on River Dragon (and others)

MajestikMøøse

Membrum virile
Jul 28, 2003
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Not Siberia
I was thinking, I've never seen Nevermore live so I have no idea, but, when Jeff does these volume swells on River Dragon, does he have a volume pedal or does he actually manipulate the volume controls on his guitar?
 
i think its just work done to the track in the studio..but it could very well be a volume pedal, and to a lesser extent, the knobs.