For the development of the GS 124, Jetter 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.