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Official effect

Parametric EQ

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

The current EQ path is compact and static: it applies a low shelf first, then a single peaking filter whose center frequency moves with `tone`, and then a high shelf. `shape` sets the amount of mid boost or cut, while `contour` controls the low shelf, so this behaves like a streamlined three-band EQ rather than a multi-node parametric section.

  • Compression, Gate & EQ
  • Library #43
  • 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

The current EQ path is compact and static: it applies a low shelf first, then a single peaking filter whose center frequency moves with `tone`, and then a high shelf. `shape` sets the amount of mid boost or cut, while `contour` controls the low shelf, so this behaves like a streamlined three-band EQ rather than a multi-node parametric section.

  • 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. 3low-shelf shaping
  4. 4single sweepable mid peak stage
  5. 5high-shelf 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

Static low shelf, single sweepable mid peak, and high shelf in series.

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
  • low-shelf shaping
  • single sweepable mid peak stage
  • high-shelf 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.
  • shape: Adjusts the gain of the single peaking EQ stage.
  • tone: Moves the peaking EQ center upward while also adjusting the final high shelf.
  • contour: Adjusts the low-shelf gain.

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.

  • shape

    Active

    Adjusts the gain of the single peaking EQ stage.

    Cuts or boosts the central mid band around the sweepable focus frequency.

  • tone

    Active

    Moves the peaking EQ center upward while also adjusting the final high shelf.

    Shifts the focus from lower mids toward upper mids and adds or removes top-end brightness.

  • contour

    Active

    Adjusts the low-shelf gain.

    Adds warmth and low-end weight or trims bass out.

Analysis

Code-derived notes

Current implementation shares the same three-band static EQ core as Dynamic EQ, 6-Band EQ, 10-Band EQ, Tilt EQ, and Mid/Side EQ.

Active blocks

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • gateCore
  • phraseMono
  • previewShiftSamples
  • eqCore
  • 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/parametric-eq.dsp
  • Output stage: DC blocker -> output gain trim -> final tanh limiter
  • Library position: 43

More In Compression, Gate & EQ

Continue through the library

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

Studio Compressor

Balanced envelope-controlled leveling with mild low-end contour shaping and a restrained high-shelf finish.

View How It Works

Optical Compressor

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

View How It Works

Dynamic EQ

Three-stage static EQ that currently uses the same shelf-plus-peak core as Parametric EQ.

View How It Works