This is the Linear Power Booster by EH. Its function is evident in its name: this pedal boosts your signal in the most uncomplicated way, similar to cranking the volume knob on your guitar. In fact, it's like having seven or eight extra notches on that knob. It's you, just louder! Set it at nine or ten (o' clock) when going from chords to single-note lines for a natural-sounding transition. As you turn it up past noon some grit is introduced, and from twelve to about two-thirty, the LPB1 functions as a crisp, defined overdrive, without any boost or cut to specific frequencies. From three onward, the sound becomes an all-out roar, which can take the shape of a savage, ballsy smackdown or a rich, sonorous opera-tenor voice, depending on your settings. It's the best sound, with the least amount of fuss. Buy it!