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Official effect

Pick-Sensitive Low-Pass

Resonant low-pass sweep that currently uses the same LFO-driven core as Resonant Low-Pass Filter rather than pick-envelope tracking.

The current code does not read input level to move the filter. It uses the same sine-LFO-driven resonant low-pass sweep as Resonant Low-Pass Filter, followed by a darker post-filter high shelf, so it is presently a naming variant rather than a true pick-sensitive response.

  • Filter, Wah & Envelope
  • Library #82
  • Preview 8s

Waveform preview

Static peaks come from the compiled FAUST preview render. The live scope is drawn from the browser playback output in real time.

Timeline
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Source
Compiled browser preview
Live oscilloscope from the browser playback output.AnalyserNode keeps the signal path unchanged while exposing the waveform.

How It Works

Technical view

The current code does not read input level to move the filter. It uses the same sine-LFO-driven resonant low-pass sweep as Resonant Low-Pass Filter, followed by a darker post-filter high shelf, so it is presently a naming variant rather than a true pick-sensitive response.

  • Filter, Wah & Envelope
  • resonant low-pass
  • waveshaping / saturation
  • delay processing
  • oscillator / LFO modulation
  • DC blocking

Signal Path

Compiled preview chain

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.

  1. 1internal picked-string demo phrase
  2. 2stereo spread with a short right-channel delay
  3. 3modulated resonant low-pass sweep
  4. 4post-filter high-shelf tone shaping
  5. 5dry / wet mix
  6. 6DC blocker
  7. 7output gain trim
  8. 8final tanh limiter

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.

Effect core

Sine-LFO-modulated resonant low-pass filter with darker post-filter high-shelf shaping.

Signal path

The static waveform and the live player both reflect this compiled signal chain.

  • internal picked-string demo phrase
  • stereo spread with a short right-channel delay
  • modulated resonant low-pass sweep
  • post-filter high-shelf tone shaping
  • dry / wet mix
  • DC blocker
  • output gain trim
  • final tanh limiter

Controls that matter

These are the currently active controls detected in the FAUST source for this effect.

  • mix: Blends the untouched stereo preview source with the filtered path after the effect core.
  • output_gain_db: Applies final post-effect level trim after DC blocking and before the output limiter.
  • focus: Sets the base center of the resonant low-pass sweep and the amount of post-filter high-shelf recovery.
  • motion: Increases sweep depth and resonance of the low-pass filter.
  • rate: Sets the speed of the internal LFO that moves the low-pass center.

Code-backed analysis

The generated description is tied to the active helper blocks and routing found in the current DSP.

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • filterCore
  • phraseMono
  • previewShiftSamples

Controls

Audible controls in this DSP

  • mix

    Active

    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.

  • output_gain_db

    Active

    Applies final post-effect level trim after DC blocking and before the output limiter.

    Matches loudness without changing the filter behavior itself.

  • focus

    Active

    Sets the base center of the resonant low-pass sweep and the amount of post-filter high-shelf recovery.

    Moves the sweep higher and opens the filtered result brighter.

  • motion

    Active

    Increases sweep depth and resonance of the low-pass filter.

    Makes the sweep feel deeper and more vocal.

  • rate

    Active

    Sets the speed of the internal LFO that moves the low-pass center.

    Changes sweep speed rather than actual pick sensitivity.

Analysis

Code-derived notes

Current implementation shares the same LFO-driven resonant low-pass core as Resonant Low-Pass Filter and does not yet track picking dynamics.

Active blocks

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • filterCore
  • phraseMono
  • previewShiftSamples
  • attackEnv
  • pickedVoice
  • fund
  • pickEnv
  • ampEnv
  • triggerAt
  • maxDelaySamples

Inactive helpers

  • synthVoice
  • organVoice
  • bellVoice
  • softsat
  • quantize
  • combLP
  • echoOnly
  • diffuser

Warnings

No current warnings are attached to this effect.

Source

  • library/filter-wah-envelope/pick-sensitive-low-pass.dsp
  • Output stage: DC blocker -> output gain trim -> final tanh limiter
  • Library position: 82

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Each effect page uses the same generated description pipeline and compiled waveform preview assets.

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Three-band formant bank with an LFO-driven vowel position for moving voice-like color.

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