Pettyjohn Electronics ROUSROUS: Distortion of Unusual Size The ROUS, Rodent of Unusual Size, is a highly evolved member of the RAT family. The ROUS features a simple but powerful four knob control set: Level, Gain, Lows and Highs, similar to the other CORE series pedals. Its gain range moves from low gain overdrive to unusually large sounding distorted tones quickly with the turn of the GAIN knob. One may take matters of fate into their own hands and journey deeper into the un