The GMP-1 is a Germanium MOSFET preamp made by Damnation Audio, a maker of heavy bass effects. It is a preamp, the stage of a pedalboard that shapes and strengthens the signal, a category covered in more depth on the Preamp Pedals page1.
Damnation Audio lists the GMP-1 as retired, and the pedal is marked sold out on the maker's product page. It is no longer in current production.1
Damnation Audio's product page carries the name "GMP-1 | Germanium MOSFET Preamp" and describes the company as making "Heavy Bass Effects", placing the pedal among bass-oriented gear such as the Damnation Audio Contour Pre and other Bass Pedals.1
The maker's product page links to downloadable manuals for the GMP-1, held in Damnation Audio's online manual vault.1
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