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Official effect

Vowel Morpher

Moving formant bank that currently uses the same LFO-driven vowel core as Formant Filter.

The current implementation matches Formant Filter and Talking Filter exactly: three parallel band-pass stages move from a shared vowel-position LFO. It already morphs between vowel-like regions, but it is not yet differentiated into a separate morphing architecture.

  • Filter, Wah & Envelope
  • Library #74
  • 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 implementation matches Formant Filter and Talking Filter exactly: three parallel band-pass stages move from a shared vowel-position LFO. It already morphs between vowel-like regions, but it is not yet differentiated into a separate morphing architecture.

  • Filter, Wah & Envelope
  • band-pass filtering
  • 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. 3LFO-driven formant position sweep
  4. 4parallel three-band band-pass bank
  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

Three-band formant bank with shared LFO-driven vowel-position modulation.

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
  • LFO-driven formant position sweep
  • parallel three-band band-pass bank
  • 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: Adjusts the lower formant band placement and bandwidth of the first band-pass stage.
  • motion: Adjusts the width of the middle formant band while contributing to the overall vowel contrast.
  • rate: Sets the speed of the internal vowel-position LFO that sweeps the band-pass centers.

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

    Adjusts the lower formant band placement and bandwidth of the first band-pass stage.

    Changes the weight and mouth-like emphasis of the lower vowel region.

  • motion

    Active

    Adjusts the width of the middle formant band while contributing to the overall vowel contrast.

    Changes how hollow or nasal the moving vowel shape feels.

  • rate

    Active

    Sets the speed of the internal vowel-position LFO that sweeps the band-pass centers.

    Changes how quickly the filter morphs between vowel-like positions.

Analysis

Code-derived notes

Current implementation shares the same three-band moving formant core across Formant Filter, Talking Filter, and Vowel Morpher.

Active blocks

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • filterCore
  • phraseMono
  • previewShiftSamples
  • vowelPos
  • 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/vowel-morpher.dsp
  • Output stage: DC blocker -> output gain trim -> final tanh limiter
  • Library position: 74

More In Filter, Wah & Envelope

Continue through the library

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

Classic Wah

Resonant low-pass wah with an LFO-driven sweep for a steady vocal-style filter arc.

View How It Works

Envelope Filter

Reactive envelope low-pass sweep that currently uses the same detector-driven core as Auto Wah.

View How It Works

Formant Filter

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

View How It Works