On Blood Mountain, he recorded with a Mesa BB750 and a newer Mesa 4x12. While watching a bunch of live videos of Mastodon on Youtube (from 2006 and 2007), he's always got a backline of SVT-CL's or VR's, and Ampeg 8x10's. Are those rented or are they his? Also, I read in a bass mag last year that he also tours with an SVT4-Pro. However, on every live video I've seen, he's using SVT-CL's and VR's. No evidence of a 4-Pro. Also, he's endorsed by Mesa. Besides that, does anyone know what he used on Call of the Mastdon, Remission, and Leviathan?