Electro-Harmonix Nano Q-Tron

The Electro-Harmonix Nano Q-Tron is a dynamic envelope-controlled filter pedal that brings expressive tone shaping to guitar, bass, keys, horns, and beyond. Drawing from EHX's decades-long legacy in filter effects, the Nano Q-Tron reacts directly to your playing style—modulating a swept filter based on the volume of your input signal to deliver everything from subtle auto-wah to bold, funky filter sweeps.

Its streamlined controls offer plenty of flexibility: the Volume knob sets the output level, while the Drive control adjusts sensitivity and responsiveness to playing dynamics. The Q knob tailors the intensity of the filter peak, and the Mode switch lets you select between Low Pass, Band Pass, and High Pass filter types for tonal emphasis across lows, mids, or highs. Housed in a compact, road-ready chassis with true bypass and powered by a 9V battery or optional adapter, the Nano Q-Tron is a powerful yet easy-to-use filter pedal perfect for any pedalboard.