A wah-wah is a human-made audio effect technique that sweeps the center frequency of a bandpass filter over time, producing a vocal-like 'wah' sound. Mechanism: the input signal passes through a bandpass filter whose center frequency is modulated by a low-frequency oscillator (LFO) or expression pedal, typically sweeping between ~200 Hz and ~2 kHz. The sweep depth, rate, and Q (bandwidth) of the filter define the effect's character. Parameters: (1) center frequency range (typically 200 Hz–2 kHz); (2) sweep rate (LFO-controlled, ~0.1–5 Hz, or expression-pedal controlled by the player); (3) filter Q (bandwidth — wider Q yields a broader, less pronounced sweep); (4) sweep depth (how far the center frequency moves). Persistence mechanism: the technique is fixed by its signal chain (bandpass filter with sweepable center frequency) and persists as hardware guitar pedals (the classic Vox wah-wah circuit), DSP plugins, synthesizer filter envelopes, and built-in patches on multi-effects units. [formal: wah-wah | substrate: behavior | horizon: a moment | explicit: yes | epoch: 0.01]
Accepted ontology entry
wah-wah
A wah-wah is a human-made audio effect technique that sweeps the center frequency of a bandpass filter over time, producing a vocal-like 'wah' sound. Mechanism: the input signal passes through a bandpass filter whose center frequency is mo…
Definition
Why it is in scope
A human-made audio effect technique: sweeping a bandpass filter's center frequency using an LFO or expression control to produce a vocal-like 'wah' sound. Built to persist as a standard effect in guitar pedals, DSP code, and studio processing.
Names and aliases
- wah-wahen · CANONICAL
Relations from this entry
- cmsq9slb70091qqqlwldnh5bwDEPENDS_ON →
Removal test (Law 8): a wah-wah cannot operate without a bandpass filter — the entire mechanism IS the sweeping of the filter's center frequency. Remove the bandpass-filter construct and the wah-wah has no working mechanism. The edge tests object-level operation, not sayability (Law 8b). Direction: wah-wah (dependent) -> band-pass-filter (dependency).
- cmsp49ekv0413jlssad11emypDEPENDS_ON →
Wah-wah sweeps the center frequency of a bandpass filter to produce a vocal-like 'wah' sound. Remove the concept of a filter and wah-wah has no working mechanism — its entire operation IS a time-varying bandpass filter. The removal test passes: wah-wah needs filter to operate now. Direction: wah-wah (dependent) → filter (dependency).
- audio-effectINSTANCE_OF →
A wah-wah is a specific kind of audio effect: it intentionally alters a sound by sweeping a bandpass filter's center frequency to produce a vocal-like 'wah' sound. Nearest kind is audio-effect (Law 11e). Direction: specific (wah-wah) -> general (audio-effect).
Relations to this entry
- wah-pedal← DERIVED_FROM
Which-came-first (Law 7): wah-wah is the technique of sweeping a bandpass filter center frequency to produce a vocal-like sound. The wah-pedal is the stompbox device built to make the wah-wah technique practical. The technique predates the dedicated pedal device. Direction: wah-pedal (newer device) to wah-wah (older technique). Pinned sense: wah-wah as the filter-sweeping technique.
Record identity
- Created
- Sep 6, 2026, 9:14 PM UTC
- Content hash
- 95c0e6414ae8035dfe5f45d8d673efe99f5260be4b4aec51495d432f9ebe385b