Sustain
How long notes hang and bloom after you pick.
- Turn up Notes keep singing — a thick fuzz wall.
- Turn down Notes decay faster; less endless sustain.
Pedals / Sustaining fuzz
Wool Wall
Sustaining fuzz · play-tested
seth — fish
seth@ninevolt:~$
Knobs
In the TUI each knob runs from low (left / 0%) to high (right / 100%). Start near noon, then nudge while you play.
Tone
Warmth versus brightness in the fuzz.
- Turn up Brighter, more open.
- Turn down Darker, woollier.
Volume
Output loudness.
- Turn up Louder.
- Turn down Quieter.
Inspired by
Electro-Harmonix Big Muff Pi (NYC / Ram’s Head lineage) — four cascaded clip stages, narrow bandwidth, violin-like sustain, scooped mids. Smashing Pumpkins Siamese Dream, Jack White Seven Nation Army, shoegaze wall-of-fuzz beds. Sustain, Tone, Volume.
Signal path
| Step | What it does |
|---|---|
| High-pass ~70 Hz | Input coupling — blocks DC and sub rumble. |
| Sustain gain | Sustain → up to ~86× (1 + sustain × 85) — drives clip stages. |
| muff_clip | tanh soft clip blended with hard ±0.82 limit — smooth sustaining fuzz. |
| Crossover LP / HP | Splits clipped signal into low and high bands; Tone shifts crossover corners. |
| Mid scoop | Reconstructed mid band attenuated — depth scales with Sustain (~62–90% cut). |
| Tone tilt | Tone boosts high-band mix and sweeps final LP cutoff brighter. |
| Tone biquad LP | Final brightness control (~280 Hz–5.2 kHz). |
| Volume + clamp | Volume output trim (0.14 + volume × 1.05). |
How we modeled it
Big Muff path: sustain gain → soft/hard clip blend → crossover mid scoop → tone LP. Sustain deepens saturation and scoop; Tone tilts highs and sweeps the final low-pass. Same crossover/scoop pattern as Buzz Saw, but with smooth muff_clip instead of HM-2 chainsaw clipping.
Simplifications
- Four clip stages collapsed into one muff_clip function - Passive BMP tone network approximated as crossover scoop + biquad LP - Mono only; no battery sag or input buffer stages