How It Works
Technical view
The current filter-delay family runs delayed repeats into two different filter branches: a resonant low-pass on the left and a resonant high-pass on the right, then adds those filtered repeats back to the dry source. `feedback` raises both the repeat regeneration and filter resonance, while `tone` brightens the delay loop and moves the filter centers upward.
- Delay & Echo
- resonant low-pass
- resonant high-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 delay core.
- 1internal picked-string demo phrase
- 2stereo spread with a short right-channel delay
- 3delayed repeats with regeneration
- 4left resonant low-pass and right resonant high-pass filtering
- 5repeat branches added over the dry source
- 6DC blocker
- 7output gain trim
- 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 delay core.
Effect core
Stereo filtered delay with resonant low-pass repeats on the left and resonant high-pass repeats on the right.
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
- delayed repeats with regeneration
- left resonant low-pass and right resonant high-pass filtering
- repeat branches added over the dry source
- 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: Scales the repeat branch above the always-present dry phrase.
- output_gain_db: Applies final post-effect level trim after DC blocking and before the output limiter.
- time: Sets the base delay time before the filtered repeat branches.
- feedback: Raises the delay-loop feedback amount and also increases the resonances of the low-pass and high-pass filter stages.
- tone: Raises the damping cutoff in the delay loop and moves the left low-pass and right high-pass centers upward.
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
Scales the repeat branch above the always-present dry phrase.
Raises repeat level without fully removing the original attack.
Applies final post-effect level trim after DC blocking and before the output limiter.
Matches loudness without changing the actual delay structure.
Sets the base delay time before the filtered repeat branches.
Moves the filtered repeats from tighter response toward longer echoes.
Raises the delay-loop feedback amount and also increases the resonances of the low-pass and high-pass filter stages.
Adds more repeat count and makes the filtered resonances ring harder.
Raises the damping cutoff in the delay loop and moves the left low-pass and right high-pass centers upward.
Makes the filtered repeats brighter and shifts their spectral focus upward.
Analysis
Code-derived notes
Current implementation shares the same split-filter repeat core across Filter Delay and Filter Pong.
Active blocks
- demo
- fx
- outputStage
- leftDemo
- rightDemo
- leftFx
- rightFx
- phraseMono
- previewShiftSamples
- echoOnly
- delayA
- pickedVoice
- combLP
- fund
- pickEnv
- ampEnv
- triggerAt
- maxDelaySamples
Inactive helpers
- synthVoice
- organVoice
- bellVoice
- softsat
- quantize
- diffuser
Warnings
No current warnings are attached to this effect.
Source
- library/delay-echo/filter-delay.dsp
- Output stage: DC blocker -> output gain trim -> final tanh limiter
- Library position: 139