A studio-grade compressor in a stompbox housing, the Keeley GC-2 Limiting Amplifier lets you fine tune the dynamics of guitars, keyboards, and virtually anything else you plug into it. It's based off of the same principles as Keeley's Bassist compressor (a major hit with the bass players here at Sweetwater), utilizing an extremely high-fidelity THAT Corp 4320 op amp for extreme frequency transparency. As for controls, the GC-2 Limiting Amplifier gives you studio-style compression, threshold, and gain knobs, so you can really dial it in to suit your instrument.