Auto Filter
A low-pass filter driven by an LFO.
PreviewNot built for macOS, Windows or Linux
AvailableEffect
Auto Wah
A resonant filter driven by your playing level.
Engine preview
Not built for macOS, Windows or Linux
About
A resonant peak pushed up the spectrum by the signal's own level. Play harder and it opens, the funk wah that tracks dynamics instead of a clock.
Build evidence
Every row below is a recorded build row or the recorded absence of one. Nothing here is inferred from what this module is meant to support.
- Module
- music.codex.auto-wah v1.0.0
- Built at
- no recorded row carries a build time; the browser lanes record none
- Closure hash
- not a Processor — no lowering closure
- Toolchain
- scriptc 64acce1ae3b8…
- moduleToolchainDist c621ffab721d…
- pluginShellKitRuntime bca003784692…
- faceShellGeneration 8533207ab81f…
- uiPreservation cd28dbd7e3d6…
- packagerVersion 3
| Format | Result | Download |
|---|---|---|
| Browser package (JS) | Not built by this module's lane this module has no release.json; its packager lane records no browser program rows | Not built for the browser |
| Browser package (WASM) | Not built by this module's lane this module has no release.json; its packager lane records no browser program rows | Not built for the browser |
| VST3 | Not built no recorded artifact row for vst3; native-lane-report.json is absent or records no vst3 row for this module | Not built for macOS, Windows or Linux |
| Audio Unit | Not built no recorded artifact row for au; native-lane-report.json is absent or records no au row for this module | Not built for macOS |
| CLAP | Not built no recorded artifact row for clap; native-lane-report.json is absent or records no clap row for this module | Not built for macOS, Windows or Linux |
| Standalone app | Not built no recorded artifact row for standalone; native-lane-report.json is absent or records no standalone row for this module | Not built for macOS, Windows or Linux |
Parity
No lane recorded an artifact; there is no parity evidence.
Presets
Start from a named sound, then adjust the instrument to make it yours.
InitDefault
How it works.
An envelope follower measures the input's level, and that measurement sets a resonant peak's centre frequency. Loud pushes the peak up toward Base Freq raised by Octaves, quiet lets it fall back to Base Freq. Nothing here runs on a clock, the sweep exists only while you are playing, and its shape is the shape of your dynamics.
The three remaining controls split cleanly between the detector and the filter. Sensitivity offsets the level at which the follower tops out, which is how you match the pedal to how hard you actually play; Q and Peak Gain shape the peak itself, deciding how narrow it is and how far it protrudes.
Web Audio has no envelope-follower node, so the browser preview builds one: a waveshaper rectifies the input, a one-pole lowpass at about 8 Hz averages it, and the result drives the filter's detune through a scaling gain. That is a genuine audio-rate follower, not an AnalyserNode polled from an animation frame, which would update only about once every 16 ms and smear exactly the transients a wah exists to track. Driving detune rather than frequency also makes the sweep exponential for free, so the same octave span sounds the same wherever Base Freq sits.
