Position
Where the wah filter sits — like rocking a wah pedal with your foot.
- Turn up Toward the toe: thinner, vocal, “quacky” highs.
- Turn down Toward the heel: darker, muffled, more throaty.
Pedals / Vox-style wah filter
Wow Wah
Vox-style wah filter · expression-ready
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.
Inspired by
Vox V846 / V847 Wah — Thomas Organ / Jenloa expression-only inductor wah (Hendrix, Clapton, Gilmour). Dunlop’s Cry Baby (GCB-95) is a 1970 copy of the same Vox circuit with an extra transistor buffer stage. Wow Wah models the Vox bandpass tank (450 Hz–1.6 kHz, ~18 dB peak, Q ~7).
Signal path
| Step | What it does |
|---|---|
| Input HPF ~230 Hz | V847 coupling (68 kΩ + 0.01 µF). |
| Position → log sweep | Rocker → 450 Hz–1.6 kHz, ~750 Hz mid (Vox / ElectroSmash). |
| 12 Hz fc smoother | Zipper-free expression sweeps. |
| LC bandpass Q = 7 | ~+18 dB at fc, cuts above/below — vowel formant. |
| Makeup + heel lift | Level restore; extra ×1.12 toward heel (stock V847 heel is weak). |
How we modeled it
Vox-first: bandpass through the LC tank (not peaking EQ). Constants tuned for V847 — slightly lower Q than aggressive Cry Baby setups, mild heel lift for the muffled heel-down character people mod around. Cry Baby shares the same sweep math; only buffer/inductor color differs on hardware.
Simplifications
- No Fasel inductor saturation or pot taper - Single biquad vs full 2-transistor + feedback LC math - Keys / MIDI instead of physical rocker in standalone