Official effect
Envelope-following low-pass sweep that opens according to input level rather than LFO time.
This path measures signal level with a low-passed absolute-value detector and feeds that envelope directly into the resonant low-pass center calculation, so louder notes open the filter wider. `motion` sets both the envelope sweep range and resonance, while the shared `rate` control is declared but unused in the current preview.
Static peaks come from the compiled FAUST preview render. The live scope is drawn from the browser playback output in real time.
How It Works
This path measures signal level with a low-passed absolute-value detector and feeds that envelope directly into the resonant low-pass center calculation, so louder notes open the filter wider. `motion` sets both the envelope sweep range and resonance, while the shared `rate` control is declared but unused in the current preview.
Signal Path
Preview source: An internally generated picked-string phrase is widened to stereo with a 19-sample right-channel delay and slight left/right shelf-EQ offsets before it hits the filter core.
An internally generated picked-string phrase is widened to stereo with a 19-sample right-channel delay and slight left/right shelf-EQ offsets before it hits the filter core.
Envelope-following resonant low-pass filter with post-filter high-shelf tone shaping.
The static waveform and the live player both reflect this compiled signal chain.
These are the currently active controls detected in the FAUST source for this effect.
The generated description is tied to the active helper blocks and routing found in the current DSP.
Controls
Blends the untouched stereo preview source with the filtered path after the effect core.
Lower settings preserve more dry attack and full-band tone; higher settings emphasize the filter treatment.
Applies final post-effect level trim after DC blocking and before the output limiter.
Matches loudness without changing the filter behavior itself.
Sets the base center of the resonant low-pass filter and the post-filter high shelf.
Moves the filter lower or higher and changes how open the result sounds.
Scales the envelope-driven sweep depth and the filter resonance.
Makes the response more reactive and more pronounced with stronger sweeps on louder notes.
Declared in the shared control set but unused in the current preview code.
Changing it currently has no effect on the sound.
Analysis
Current implementation shares the same envelope-following resonant low-pass core as Envelope Filter and Touch Wah, and the shared rate control is inactive.
No current warnings are attached to this effect.
More In Filter, Wah & Envelope
Each effect page uses the same generated description pipeline and compiled waveform preview assets.