The Rodent 81 is a modified version of the 1981 Inventions DRV, which is based on the Whiteface ProCo rat. It has three controls, with the CUT control being the main feature. The tone stack is highly usable and provides a rich, musical overdrive with an elegant voice in the low-mids and bass frequencies. The pedal has an amp-like response across all pickup settings, allowing for dynamic picking and complex chord voicings. The drive section can function as a clean boost or a higher gain effect with high clarity. The Rodent 81 runs at 18v using an internal charge pump, powered by a 9v supply.

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