The Fulltone Fat-Boost 3 is a Discrete, Class-A, FET (Field-Effect-Transistor) pedal offering up to 35dB of non-distorted Gain without changing your signature sound ...unless you so desire You can fatten/distort your tone, brighten or mellow up the sound, add or subtract Bass, and add even-order harmonics! The FB-3 has True-Bypass switching (using the finest switch made, the Fulltone 3PDT) and incorporates a super-bright LED without the loud popping sound thanks to our proprietary anti-pop circuitry.