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innexus

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更新日2026年7月18日 20:39

Domain knowledge for the Innexus harmonic-resynthesis instrument — the analysis→resynthesis signal path, the two analysis front-ends, load-bearing invariants (mono harmonic-sieve, per-partial bandwidth), and where the deep docs live. Use when working on Innexus, harmonic/additive resynthesis, sample or live spectral analysis, or Innexus presets — especially outside plugins/innexus/ where the leaf CLAUDE.md won't auto-load.

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rolandzwaga

rolandzwaga/krate-audio

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Innexus — Harmonic Analysis / Resynthesis Instrument

Innexus (AU aumu) analyzes audio into per-frame harmonic snapshots (HarmonicFrame + ResidualFrame) then additively resynthesizes them with evolution/physics/modulation shaping. When editing under plugins/innexus/, its leaf CLAUDE.md auto-loads with build/test/param facts — this skill carries the domain lore that applies when reasoning about Innexus from elsewhere (DSP library, presets, tooling).

Signal path (per voice)

Two input sources feed one frame contract, selected by inputSource_:

Sample mode (≤0.5): drag-dropped WAV → SampleAnalyzer (background std::thread) → immutable SampleAnalysis, published to the audio thread by atomic pointer swap; voice advances currentFrameIndex.
Sidechain mode (>0.5): aux bus 0 downmixed to mono → LiveAnalysisPipeline on the audio thread, emitting one frame per STFT hop.

Frame selection (voice_.morphedFrame): Recall│Capture│ManualFreeze+morph(lerp)│confidence-gated freeze, then applyModulatorAmplitude → applyHarmonicPhysics → broadcastFrameToVoices (copy to each voice). Per voice: HarmonicOscillatorBank (up to kMaxPartials = 96 Gordon-Smith MCF sines; freq/amp/phase seeded from partials, phase state NOT reset across frames = continuity) + exciter{Impact│Bow│Residual} → resonator{Modal│Waveguide, equal-power xfade} → BodyResonance → PhysicalModelMixer(residual↔physical). Σ voices × 1/√activeCount → global SympatheticResonance → master gain → tanh soft-limiter → out.

Analysis pipeline

Both paths share: PreProcessingPipeline (DC → 30 Hz HPF → transient suppress → noise gate) → YIN pitch → dual Blackman-Harris STFT (short 1024/512 for temporal tracking, long 4096/2048 for low-freq resolution) → PartialTracker (Hungarian match + harmonic sieve) → HarmonicModelBuilder (dual-timescale smooth) → residual bands. Offline adds a two-pass polyphony guard: if F0 is unstable/noisy, pass 2 re-runs with a fixed F0 and voiced=false (sieve OFF) so all peaks survive — the conditional poly fix.

Load-bearing constraints (violating these breaks presets, tests, or sound)

Never globally disable the mono harmonic sieve. The sieve runs only when f0.voiced; poly/pass-2 code turns it off conditionally via a neutral voiced=false F0. The monophonic sieved path is load-bearing.
Per-partial bandwidth (0=sine..1=noise) is the historical noise bug. Inflated bandwidth injects noise on every partial. Physics/modulators touch amplitudes only; pass-2 poly sets bandwidth=0 (unreliable without the sieve). Treat any bandwidth write with suspicion.
No frees on the audio thread. Superseded SampleAnalysis goes to pendingDeletion_, freed only in setActive/dtor. currentAnalysis_ is an atomic acquire/release swap.
UI data bridge: sendDisplayData piggybacks a DisplayData block on the DataExchange handler (~30 Hz throttle) with a Tier-3 sharedDisplay_ polling fallback — don't add new IMessage loops.
Param IDs: section bases — 200s = envelope, 400s = harmonic. kPartialCountId=202 is a StringListParameter ("48"/"64"/"80"/"96"), not a range — never swap a registered VST3 param type.
Preset categories are FIXED (7): Brass and Winds, Drums and Perc, Found Sound, Keys, Pads and Drones, Strings, Voice. Never invent new ones.

Deep tooling (read these for real work)

Plugin specifics: plugins/innexus/CLAUDE.md — skeleton, param-ID scheme, innexus_tests target (unit tests/unit/{processor,vst}/ + tests/integration/, run both), pluginval path, AU config.
Frame contract & shared DSP: dsp/include/krate/dsp/processors/harmonic_types.h (HarmonicFrame, Partial, kMaxPartials), residual_types.h, harmonic_oscillator_bank.h.
Analysis internals: plugins/innexus/src/dsp/ (sample_analyzer, live_analysis_pipeline, pre_processing_pipeline, dual_stft_config.h) and shared partial_tracker.h / harmonic_model_builder.h.

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name	innexus
description	Domain knowledge for the Innexus harmonic-resynthesis instrument — the analysis→resynthesis signal path, the two analysis front-ends, load-bearing invariants (mono harmonic-sieve, per-partial bandwidth), and where the deep docs live. Use when working on Innexus, harmonic/additive resynthesis, sample or live spectral analysis, or Innexus presets — especially outside plugins/innexus/ where the leaf CLAUDE.md won't auto-load.
allowed-tools	Read, Glob, Grep

Innexus — Harmonic Analysis / Resynthesis Instrument

Signal path (per voice)

Two input sources feed one frame contract, selected by inputSource_:

Sample mode (≤0.5): drag-dropped WAV → SampleAnalyzer (background std::thread) → immutable SampleAnalysis, published to the audio thread by atomic pointer swap; voice advances currentFrameIndex.
Sidechain mode (>0.5): aux bus 0 downmixed to mono → LiveAnalysisPipeline on the audio thread, emitting one frame per STFT hop.

Analysis pipeline

Load-bearing constraints (violating these breaks presets, tests, or sound)

Never globally disable the mono harmonic sieve. The sieve runs only when f0.voiced; poly/pass-2 code turns it off conditionally via a neutral voiced=false F0. The monophonic sieved path is load-bearing.
Per-partial bandwidth (0=sine..1=noise) is the historical noise bug. Inflated bandwidth injects noise on every partial. Physics/modulators touch amplitudes only; pass-2 poly sets bandwidth=0 (unreliable without the sieve). Treat any bandwidth write with suspicion.
No frees on the audio thread. Superseded SampleAnalysis goes to pendingDeletion_, freed only in setActive/dtor. currentAnalysis_ is an atomic acquire/release swap.
UI data bridge: sendDisplayData piggybacks a DisplayData block on the DataExchange handler (~30 Hz throttle) with a Tier-3 sharedDisplay_ polling fallback — don't add new IMessage loops.
Param IDs: section bases — 200s = envelope, 400s = harmonic. kPartialCountId=202 is a StringListParameter ("48"/"64"/"80"/"96"), not a range — never swap a registered VST3 param type.
Preset categories are FIXED (7): Brass and Winds, Drums and Perc, Found Sound, Keys, Pads and Drones, Strings, Voice. Never invent new ones.

Deep tooling (read these for real work)

Plugin specifics: plugins/innexus/CLAUDE.md — skeleton, param-ID scheme, innexus_tests target (unit tests/unit/{processor,vst}/ + tests/integration/, run both), pluginval path, AU config.
Frame contract & shared DSP: dsp/include/krate/dsp/processors/harmonic_types.h (HarmonicFrame, Partial, kMaxPartials), residual_types.h, harmonic_oscillator_bank.h.
Analysis internals: plugins/innexus/src/dsp/ (sample_analyzer, live_analysis_pipeline, pre_processing_pipeline, dual_stft_config.h) and shared partial_tracker.h / harmonic_model_builder.h.