INSTANT Lo-Fi Junky Vexter Series Thank you for viewing. (From the internet, as follows) This is a new type of filter-based effector that turns the input signal into "Lo-Fi." The knob located in the center of the unit, when turned to the left, applies compression, and when turned to the right, controls the "Lo-Fi" sound. The two controls on the right control the "depth" and "speed" of the vibrato. Also, the switch in the upper right allows you to switch the vibrato waveform in three stages. It has some signs of use, but it's clean. Box, cloth, and instruction manual (English) are included. New alkaline batteries have been installed.