Xotic BB Preamp Pedal Capable of a 30dB+ clean boost with an adjustable +/-15dB 2-band active EQ, adding a wide range of harmonic content to your ideal sound Uses a pre-gain stage, allowing the pedal to go from a very pristine clean to a very smooth, compressed, overdriven sound True bypass eliminates any signal interference when switched off Can be used with 9V battery or AC adapter (optional, not included) From pristine clean boost to smooth overdriven sound, the BB Preamp lets you dial in just the right lead tone you want with its 2-band active EQ