The Electro-Harmonix LPB-3 Linear Power Booster & EQ is a compact pedal that delivers up to +33 dB of clean boost, with a switchable +20 dB setting. It features a three-band active EQ with parametric mids (240 Hz to 3.3 kHz), plus Pre-Gain, a mid Q switch, and selectable buffered or true bypass. Internal ±15V rails provide extra headroom.