How It Works
Technical view
The current single-voice transpose family does not pitch-shift the dry preview phrase in real time. Instead, it layers one separately synthesized picked-string phrase over the dry source, offsets the synthetic right side with a short delay, and shapes that auxiliary voice with a high shelf controlled by `width`. `voice` scales the level of the synthesized layer, `mix` blends it against the dry phrase, and the shared `blend` control is declared but unused in these patches.
- Pitch, Harmony & Detune
- 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; the current pitch family mostly layers separately synthesized picked-string phrases over that demo rather than pitch-shifting the dry input in real time.
- 1internal picked-string demo phrase
- 2stereo spread with a short right-channel delay
- 3separately synthesized auxiliary pitch phrase
- 4short right-side offset on the synthetic layer
- 5high-shelf shaping on the synthetic layer
- 6dry / synthetic blend
- 7DC blocker
- 8output gain trim
- 9final tanh limiter
Preview source
An internally generated picked-string phrase is widened to stereo as the dry source; the current pitch family mostly layers separately synthesized picked-string phrases over that demo rather than pitch-shifting the dry input in real time.
Effect core
Dry phrase plus one separately synthesized auxiliary pitch phrase with right-side offset and high-shelf 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
- separately synthesized auxiliary pitch phrase
- short right-side offset on the synthetic layer
- high-shelf shaping on the synthetic layer
- dry / synthetic 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 stereo preview phrase and the synthesized pitch layer.
- output_gain_db: Applies final post-effect level trim after DC blocking and before the output limiter.
- voice: Raises the level of the synthesized pitch layer before it is mixed with the dry source.
- width: Adjusts the high-shelf shaping on the synthesized pitch layer and its offset right-channel copy.
- blend: 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
Blends between the dry stereo preview phrase and the synthesized pitch layer.
Lower settings stay closer to the direct phrase; higher settings push the synthetic transposed layer forward.
Applies final post-effect level trim after DC blocking and before the output limiter.
Matches loudness without changing the actual pitch-layer structure.
Raises the level of the synthesized pitch layer before it is mixed with the dry source.
Makes the auxiliary octave or transposed voice more prominent.
Adjusts the high-shelf shaping on the synthesized pitch layer and its offset right-channel copy.
Makes the synthetic layer darker at low settings and brighter and more open at high settings.
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 shares the same single auxiliary-voice architecture across Octave Down, Octave Up, Capo Transpose, and Drop Tune; these patches differ by the prewritten synthetic note set, and the declared blend control is inactive.
Active blocks
- demo
- fx
- outputStage
- leftDemo
- rightDemo
- leftFx
- rightFx
- phraseMono
- previewShiftSamples
- pitchLeft
- pitchRight
- pickedVoice
- pitchLayer1
- 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/pitch-harmony-detune/octave-up.dsp
- Output stage: DC blocker -> output gain trim -> final tanh limiter
- Library position: 199