Analog boost effector, equipped with four control knobs. - Model Name: MF BOOST - Brand: Moog - Effect Type: Analog Boost - Controls: GAIN, BOOST, LEVEL, TONE - Input/Output Terminals: IN, OUT, EXP - Power: 9V DC This is a rather rare booster from Moog. Operation has been confirmed. Comes with the box and instruction manual. While it's not the type of effector that drastically changes the sound (but it still functions as a booster), just running your sound through this effector makes it sound about two steps more high-quality. It has a thick, rich sound while still being delicate. The troublesome specification of controlling the boost with an expression pedal is also wonderful. You can feel the warmth and depth unique to analog. The TONE control is also quite effective, so you can choose from a variety of genres. I think those who want to improve the fundamental tone of their guitar will understand the value of this.