Fairfield Circuitry releases 20% More slew-limiting distortion pedal
September 10, 2025 · 1 sources
Fairfield Circuitry has released the 20% More Limiting Distortion, a distortion pedal built around a slew limiter rather than conventional clipping stages. Delicious Audio reported the pedal on September 10, 2025; Guitar Pedal X had covered it on April 3, 2025.
RockBoard describes the result as a combination of low-pass filtering, resonant triangle wave oscillations, pseudo-wavefolding and JFET clipping. Delicious Audio describes the slew limiter as acting as a dynamic low-pass filter, with the Slew control setting how aggressively the pedal clamps down on fast signal changes, from smooth saturation to gated, splattery decay. It says turning up the Feed knob makes the circuit self-oscillate, and the Blend control mixes in a raw square-wave copy of the signal.
Delicious Audio lists three toggle switches: E (ENV DEST), which selects whether the envelope follower modulates Feed or the output low-pass gate; U (FULL WAVE), which activates a full-wave rectifier for an upper-octave effect; and D (SUB), with positions for one octave below, two octaves below or no sub-octave. Guitar Pedal X lists the controls as Volume, Blend, Input, Low Pass Gate, Feedback, Slew, Envelope (LPG / FEED), Octave Up on/off, Octave Down (-1 / 0 / -2) and a Slew Limiter Frequency CV input. Delicious Audio also notes expression control and internal trim pots.
RockBoard lists the circuit as analog, running on 9V DC center-negative at 20mA. Guitar Pedal X gives the Fairfield Circuitry webstore price as S$389 CAD (about $270 USD) and reports the pedal in international distribution.
"But what they ended up with was a sort of Distorted Low Pass Filter, with elements of wave folding."
Guitar Pedal X writes that the project began as a study of an old schematic resembling a square/triangle oscillator data sheet, and describes the pedal's voicing as "a cool somewhat clangy distortion" that it files under an acquired taste.