Vintage Leslie Rotating Speaker.
For years, Trey used a vintage Leslie rotating speaker that was controlled from the floor by the wedge-shaped Goff Trek II Leslie controller pedal. You can see this pedal in the first of the two pictures above (New Year’s 2013-14 at MSG). The vintage wooden Leslie cabinet is in the bottom right corner of that photo. The next photo is from Telluride 8-9-10 and you can see the vintage Leslie behind Trey’s rack and 2×12. In recent years, the vintage Leslie has been replaced (see below) by the modern Leslie G-37, a rotating speaker designed specifically for guitar. The Goff Trek II controller has disappeared.
Trey's Guitar Rig 