Nano Q-Tron

The input level, or envelope, controls the cutoff or centre frequency of the filter. Harder picking pushes the sweep further, so results range from subtle movement to pronounced auto-wah.

Drive sets the sweep sensitivity, and Q sets the peak bandwidth of the filter. Vol matches the effect level to the bypassed signal or adds a boost.

A three-way switch selects low-pass, band-pass or high-pass response. Low-pass emphasises the lows, band-pass the midrange and high-pass the highs. The pedal suits guitar, bass, keyboards and horns, and uses true bypass.