Fairfield Circuitry 20% More Slew Limiting Distortion

The 20% More Slew Limiting Distortion: Sonic chaos, controlled

Analog Signal Shaping with Slew Limiting Distortion

The Fairfield Circuitry 20% More delivers a truly unique approach to overdrive and distortion by building its core around a slew limiter—an electronic mechanism that restricts how fast your signal can change. This translates into a steep, harmonically rich low-pass response that warps clean guitar tones into synthy, textured saturation. As feedback increases via the FEED control, those limited voltage slopes morph into triangle wave oscillations. Push your input level hard enough, and you’ll experience pseudo-wavefolding and synthetic overtones that sound like a glitchy modular system tucked inside a stompbox.

Envelope Following and Creative Modulation

20% More features an internal envelope follower with two destination options, adding dynamic modulation to either the feedback or the low-pass gate section. When routed to FEED, louder input levels amplify oscillation, while routing to LPG creates a sidechain-like ducking effect that adds percussive bounce to your playing. Whether you're coaxing noisy swells or rhythmic thumps, these interactions lend the circuit a touch-sensitive responsiveness that rewards exploration.

Square Wave Blending and Sub-Octave Depth

Use the BLEND control to add a square wave version of your signal along with two clock-divided sub-octaves—toggle between -1 or -2 octaves for a throaty, analog synth-style bass undercurrent. Summed through diodes, the sub octave has a unique 75% pulse width character, injecting a throbbing voice beneath your core tone that shines when you balance it with the distorted top end.

Switchable Analog Octave Up via Full Wave Rectification

A full wave rectifier inside 20% More provides more than just envelope shaping—it also serves as a switchable analog octave up. This circuit hard-clips the signal when the input gain surpasses noon, delivering bright, harmonic-squashed upper tones that cut with authority. Add it in for an aggressive edge or blend it subtly for added harmonic complexity.

Internal Tweaks for Dialed-In Destruction

Inside the pedal, you'll find two user-adjustable trimpots: TR3 sets the DRIVE level feeding the JFET clipping stage, while TR2 controls the SENSitivity of the envelope. Dial these in to personalize how much chaos you want from your dynamics. Two additional calibration trimmers are reserved for factory settings and should be left untouched.

Specifications

• INPUT: Mu amp JFET preamp with high gain

• BLEND: Mixes in square wave and sub-octave copy of input

• VOLUME: Master output level

• SLEW: Controls slew limiter frequency

• FEED: Feedback control for the slew core

• LPG: Resonant low-pass gate

• D: Clock-divided sub-octave switch (-1 or -2 oct)

• U: Analog octave up toggle

• E: Envelope destination selector (to LPG or FEED)

• INTERNAL CONTROLS:

  • TR3: Sets DRIVE amount into JFET clipper

  • TR2: Adjusts envelope SENSitivity

• Power requirement: 9.6VDC, 20 mA (center negative)

• CV Input range: 0-5V normal, 0-8V max

• Dimensions: 4.7" x 3.8" x 1.9"

This effects pedal ships fully insured with signature required.