Building off the popularity and foundation of the original RAT Pedals, this new model is entirely built in the United States and features complete tonal flexibility through a choice of original or MOSFET clipping circuits. The MOSFET clipping section in the new pedal provides a subtle smoothing in the upper mids and a more amp-like tone throughout the range of the RAT, without loss of the basic feel of the classic pedal. The new FAT RAT Pedal also features a bass enhancement that increases the bass response, which is perfect for bassists and guitar players who tune down their instruments. The new pedal will now run on nine- to 18-volts of DC power, for users looking for the best headroom and audio fidelity. Lastly, the FAT RAT also includes a socketed op-amp, which allows users to easily change between the stock OP07DP and other popular chips.