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Official effect

Half-Speed Looper

Currently a synthetic lower slow phrase over the dry source rather than a true half-speed loop playback engine.

The current `Half-Speed Looper` does not replay captured audio at half rate. Instead, it mixes in a separately synthesized lower, longer phrase over the dry demo and offsets that synthetic layer on the right side with a short delay. `shape` raises the level of the slow phrase, while both `motion` and `tone` are inactive.

  • Looper, Freeze & Glitch
  • Library #219
  • 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 `Half-Speed Looper` does not replay captured audio at half rate. Instead, it mixes in a separately synthesized lower, longer phrase over the dry demo and offsets that synthetic layer on the right side with a short delay. `shape` raises the level of the slow phrase, while both `motion` and `tone` are inactive.

  • Looper, Freeze & Glitch
  • 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 as the dry source, and the current effect also layers a separately synthesized held or slowed phrase rather than capturing the live input into a loop buffer.

  1. 1internal picked-string demo phrase
  2. 2stereo spread with a short right-channel delay
  3. 3separately synthesized lower slow phrase
  4. 4short right-side offset on the synthetic layer
  5. 5dry / half-speed blend
  6. 6DC blocker
  7. 7output gain trim
  8. 8final tanh limiter

Preview source

An internally generated picked-string phrase is widened to stereo as the dry source, and the current effect also layers a separately synthesized held or slowed phrase rather than capturing the live input into a loop buffer.

Effect core

Dry phrase plus a separately synthesized lower slow phrase with a short right-side offset.

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
  • separately synthesized lower slow phrase
  • short right-side offset on the synthetic layer
  • dry / half-speed blend
  • 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 between the dry preview phrase and the synthesized lower slow phrase.
  • output_gain_db: Applies final post-effect level trim after DC blocking and before the output limiter.
  • motion: Declared in the shared control set but unused in the current preview code.
  • shape: Raises the gain of the synthesized half-speed phrase before it is mixed with the dry source.
  • tone: Declared in the shared control set but unused in the current preview code.

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
  • leftFx
  • rightFx
  • phraseMono

Controls

Audible controls in this DSP

  • mix

    Active

    Blends between the dry preview phrase and the synthesized lower slow phrase.

    Higher settings bring the half-speed-style layer forward over the dry source.

  • output_gain_db

    Active

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

    Matches loudness without changing the actual loop, freeze, or glitch structure.

  • motion

    Active

    Declared in the shared control set but unused in the current preview code.

    Changing it currently has no effect on the sound.

  • shape

    Active

    Raises the gain of the synthesized half-speed phrase before it is mixed with the dry source.

    Makes the slower lower layer more prominent.

  • tone

    Active

    Declared in the shared control set but unused in the current preview code.

    Changing it currently has no effect on the sound.

Analysis

Code-derived notes

Current implementation uses a fixed synthetic lower phrase rather than replaying captured audio at half speed, and the declared motion and tone controls are inactive.

Active blocks

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • leftFx
  • rightFx
  • phraseMono
  • previewShiftSamples
  • halfWet
  • maxDelaySamples
  • pickedVoice
  • halfMono
  • fund
  • pickEnv
  • ampEnv
  • triggerAt

Inactive helpers

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

Warnings

No current warnings are attached to this effect.

Source

  • library/looper-freeze-glitch/half-speed-looper.dsp
  • Output stage: DC blocker -> output gain trim -> final tanh limiter
  • Library position: 219

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