A clean booster equipped with a 2-band EQ. There are three controls: Boost, Treble, and Bass. A wide range of volume settings are possible, from completely silent to approximately 27 dB amplification. Equipped with Treble and Bass 2-band active EQ. Both cut and boost can be set, Treble can control the band including the attack component of the strings, and Bass can control the band that controls the thickness of the sound. You can adjust the brightness of the indicator LED by operating the control located on the right side of the main unit with a small screwdriver.