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Official effect

Downward Expander

Envelope clamp that currently behaves as the same hard gate used by Noise Gate rather than as a gentler ratio-based expander.

This preview currently uses the exact clamp-style gate path used by Noise Gate: a smoothed absolute-value envelope is pushed through a threshold-and-multiplier calculation and clamped into a 0-to-1 gain control. That means it behaves more like a hard gate today than a dedicated downward expander with a gentler slope.

  • Compression, Gate & EQ
  • Library #53
  • 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
0:00 / 0:08
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

This preview currently uses the exact clamp-style gate path used by Noise Gate: a smoothed absolute-value envelope is pushed through a threshold-and-multiplier calculation and clamped into a 0-to-1 gain control. That means it behaves more like a hard gate today than a dedicated downward expander with a gentler slope.

  • Compression, Gate & EQ
  • 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 dynamics or EQ core.

  1. 1internal picked-string demo phrase
  2. 2stereo spread with a short right-channel delay
  3. 3smoothed envelope follower
  4. 4clamp-style gate / expansion stage
  5. 5post-processing high-shelf tone shaping
  6. 6dry / wet mix
  7. 7DC blocker
  8. 8output gain trim
  9. 9final 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 dynamics or EQ core.

Effect core

Smoothed-envelope clamp gate with post-gate high-shelf tone 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
  • smoothed envelope follower
  • clamp-style gate / expansion stage
  • post-processing 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 processed path after the core effect.
  • output_gain_db: Applies final post-effect level trim after DC blocking and before the output limiter.
  • squeeze: Aliases into the internal threshold term used by the clamp gate.
  • tone: Adjusts the post-gate high shelf.
  • contour: Raises the multiplier that steepens the clamp gate response.

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
  • gateCore
  • phraseMono
  • previewShiftSamples

Controls

Audible controls in this DSP

  • mix

    Active

    Blends the untouched stereo preview source with the processed path after the core effect.

    Lower settings keep more dry attack and natural dynamics; higher settings push the processed behavior forward.

  • output_gain_db

    Active

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

    Matches loudness without changing the actual dynamic or EQ structure.

  • squeeze

    Active

    Aliases into the internal threshold term used by the clamp gate.

    Higher settings allow more low-level content through before the gate closes.

  • tone

    Active

    Adjusts the post-gate high shelf.

    Shapes how bright the expanded-or-gated result sounds.

  • contour

    Active

    Raises the multiplier that steepens the clamp gate response.

    Makes the transition between open and closed states more abrupt.

Analysis

Code-derived notes

Current implementation shares the same clamp-style gate core as Noise Gate, Intelligent Noise Suppressor, and Resonance Suppressor, and is not yet a gentler ratio-based expander.

Active blocks

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • gateCore
  • phraseMono
  • previewShiftSamples
  • expandEnv
  • 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/compression-gate-eq/downward-expander.dsp
  • Output stage: DC blocker -> output gain trim -> final tanh limiter
  • Library position: 53

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Continue through the library

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

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Smooth envelope-leveling compressor that currently uses the same gain-scaling core as Studio Compressor.

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Parametric EQ

Three-stage EQ with low shelf, one sweepable mid peak, and a final high shelf.

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