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Jetter GS124 is a Dumble style overdrive in a pedal. Awesome sounding overdrive pedal and its addicting.

Featuring a streamlined interface consisting of only level, drive and contour knobs, the Jetter GS 124 is a deceptively simple overdrive with a lot of power under the hood. Designed to emulate the classic sounds of Dumble amps, this effect can function as an “always on” board staple to give your tone a fat boost or your overdrive for a throaty growl on solos.

From Jetter website:
Recently, I had the opportunity to spend a couple of days up close and personal with a guitarist who tours with two Dumble ODS amplifiers in his rig. That experience rekindled my interest in trying to replicate that sound in a pedal.

For the development of the GS 124, I used a very accurate clone of ODS #124 using blind switching for evaluation. The goal was to have the pedal became virtually indiscernible from the amp. The GS 124 is not a generic “D-style” pedal, rather, it is specific sonic replication of a particular amp.
No bells and whistles; no extra knobs and switches. What the GS 124 does is match the tone and feel of the amp.

The GS 124 is amp friendly and particularly likes amps that are set blackface clean but that is only the starting point.