I am selling a JanRay clone due to equipment changes. Purchased from a personal maker. The basic performance is the same as the original, and it seems the internal knobs have been brought to the surface. Top left is volume, top right is gain, bottom left is bass, bottom right is treble, and the center knob adjusts the edge of the sound. It can be used without problems with a center-negative 9v power supply, but please understand that this is a personally made item and is sold as-is, with no returns or exchanges.