Greg Cartwright

The in-house G-12 at Daptone's House of Soul was used on Shattered, as mentioned producer and engineer Wayne Gordon in this August 28, 2014 Electronic Musician article,

“For Mike (Catanese)’s and Greg’s guitars, they used [the studio’s] Ampeg Gemini, a couple of Magnatones, and Greg brought in a boutique amp of his own. Mike plays a ’70s Silvertone that sounds f*cked up in a good way, which helps."

The specification of a G-12 is made in this November 1, 2007 Electronic Musician article by Daptone founder Gabriel Roth (a.k.a Bosco Mann), who describes how he acquired it.

Ampeg Gemini G-12 guitar amp: “About 10 years ago, I was walking down the street on my way to the studio,” Roth says, “and as I passed a building that was being demolished, I felt a bang against my leg. They were gutting the building and one guy was throwing all the garbage out the door over the sidewalk to another guy on the street who was tossing it into a dumpster. That Gemini is what hit me in the leg on its way to the dumpster. How's that for fate? Didn't even need to repair it.”