Pro CoPro Co actually comes from the audio and PA area and manufactures DI boxes, etc. 1978, an employee who had previously repaired pedals for the local scene, had the idea of experimenting with distortion circuits. The result is one of the biggest hits in effect pedal history: the legendary "The Rat" distortion pedal. To date, the Rat pedal with its characteristic sound is still sought after with its characteristic sound. Available in various versions.