The Skinner Box is based on the original "Bud Box" Rat and made with the obsolete, metal can version of the LM308. The can version gives the pedal a warmer tone. The Skinner box is very versatile. Not only does it give you huge, fat distortion, it also gives you amazing overdriven tones when turning the gain down around 12 o'clock. The tone control has a good sweep from high to low and works well with the gain control.