Upon investigation, it appears to be a rare effector with limited distribution in Japan. It's a powerful device that can emulate the sound of an early 80s Marshall JCM800. Clicking the middle switch allows you to switch between three levels of drive boost. The size of the unit and its deep orange color are quite striking. Operation has been confirmed. Although there is some evidence of use, the condition is surprisingly good for being 30 years old. - Model Name: tube-it - Color: Orange - Input Terminals: IN - Output Terminals: OUT - Control Knobs: Treble, Bass, Sustain, Output, Boost Thank you for viewing.