Wonderful UK made boosterThe F1 Booster is a clean boost pedal which has greater flexibility than simple boosters or treble boosters. Built to the same high standards as all Rothwell pedals - with top quality components, meticulous circuit design and hand polished and engraved cases - this pedal allows you to fine tune the sound with a tone control and a mid contour switch. The mid contour gives a scooped mid range when set to the down position (10dB cut at 550Hz) and a very gentle boost (4dB at 700Hz) when set to the up position. In both cases the eq is based on simple passive circuitry very similar to that found in vintage amps. This makes the effect very natural sounding without any type of strange nasal tonality.