Amplification: Mesa Boogie Mark III Long head; 2 felt-covered 2×12 cabs. Bogner Shiva combo behind stage is plugged in and may be more than just backup. Leslie G-37 rotating speaker.
Guitars: 1996 Koa (chrome pickup covers removed). Note: Trey told Jambase the following about his guitar for Summer 2015: “I replaced the pick ups on all my old guitars with double space single coil pickups that fit into the existing space where my old humbuckers used to be. And I was able to use that single coil sound throughout last summer.” This may explain why the chrome covers were removed. Most single-coils are lower output than PAF-style humbuckers, and the covers would only mute them further. Commenters have suggested these may be Seymour Duncan Stag Mags, which seems plausible.
Rack Pedals: Tubescreamers (note: no Analogman Sunface logo on these), Uni-vibe, H&K Tube Factor; Supa-Puss.
In this shot from the Oregon show (7-21-15) he Mesa Boogie is behind Trey to his right. The felt covered 2×12’s are stacked horizontally behind him. The rack sits above the Boogie, and above the rack sit the rack pedals. You can clearly see the green Tubescreamers from this angle.
This overhead shot from Nashville (8-4-15) gives us a good angle on the pedals sitting on the rack. The Univibe is slightly cut off at the top right. Below it you can see the series Tube Screamers and the H&K next to them. This also gives us a clear shot of the floor array. From Trey’s left, you can see the Tru-Tron (in white), then the Whammy II and Octave pedals , the CAE switcher, the Boomerang, and then the wah.
This angle gives us a clear look at the Leslie G-37 and the Bogner Shiva combo, which is plugged in but not mic’d.
This shot from Grand Prairie (7-29-15) shows the top of the rack. You can see the Tubescreamers, which in this case do NOT have Analogman sunfaces. Behind them to their left, there’s a Way Huge Supa-Puss (it’s the blue pedal). You can also clearly see the chrome covers have been removed from the humbuckers on Trey’s ’96 Koa.