Guitar pedal effect - boost/overdrive. The BB Preamp offers a wide variety of sounds. It's capable of a +30 dB clean boost with an adjustable ±15dB two band active EQ which adds a wide range of harmonic content to your ideal sound. The BB also utilizes a pre-gain stage which allows the pedal to go from a very pristine clean to a very smooth, compressed, overdriven sound. True bypass for eliminating any signal interference when switched off.