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A delivered gap is not a missing translation. The delivery arrives and says this target language does not voice this utterance, with a reason - the translation renders a different paragraph, say. That is a different problem with a different fix, and the reviewer needs to be able to tell them apart. The reason was being thrown away. The row is stored with an empty text and a review_reason; the resolver skipped every row with empty text, so the gap was dropped and the review lane said "Chinese has not been translated yet". That is a false statement about a translation that was delivered and rejected. So the resolver now keeps a not-voiced row as a gap with its reason, the chapter page renders it as a gap rather than as missing text, and the language page lists the delivered gaps under "Needs attention" with their reasons. A gap row is also no longer counted as translated text, so the coverage the reviewer sees is the coverage the book has. 4 new tests. Suite: 913 passed, 8 failed (the same 8 pre-existing failures). Also adds scripts/probe_cross_language_tts.py: the open prerequisite for any target-language audio lane is whether Qwen3-TTS can speak Chinese with an English voice reference. The probe answers it by transcription rather than by listening - Whisper transcribes each clip and reports what language it heard, and the English-reference clip reading Chinese is compared against the same clip reading Chinese with English phonology, so the only variable is the language parameter.
UmbraAudio
Quality-first multi-pass audiobook generation from English manuscripts.
Features
- 5-pass pipeline: Analysis → Voice Design → Mapping → Test → Generate
- Multi-engine TTS: Chatterbox (primary), Qwen3-TTS (secondary)
- LLM-enhanced: BookNLP for NLP, LLM for profiling/emotion/pronunciation
- Web review: FastAPI + HTMX at checkpoints for human approval
Quick Start
python -m umbraaudio.cli init <manuscript.epub> --name 'My Book'
python -m umbraaudio.cli analyze
python -m umbraaudio.cli voices
python -m umbraaudio.cli review
Requirements
- Python 3.11+
- NVIDIA GPU with CUDA support (RTX 3060 or better recommended)
- ffmpeg
Development
pip install -e ".[dev]"
ruff check umbraaudio/
pytest tests/ -v
Commit cadence: commit at least once every Sunday. Never leave a week (let alone a month) of work uncommitted — a single accidental
git checkouton 2026-09-20 wiped out a month of changes toumbraaudio/web/routes.py. SeeAGENTS.md→ Commit Cadence.
scripts/commit_check.sh enforces the nudge: it exits non-zero once the tree has been dirty
longer than a week. The LaunchAgent com.umbraaudio.commitcheck runs it every Sunday at
18:00 and posts a macOS notification when there is uncommitted work.
scripts/commit_check.sh # warn if dirty > 7 days
scripts/commit_check.sh --days 3 # tighter threshold
scripts/commit_check.sh --any # warn on any uncommitted change
Rebuilding from source
The repo tracks source only; large runtime data is reconstructed as needed.
-
Models: weights are not committed (see
.gitignore). Download them:bash scripts/download_models.sh # ~9 GB, targets ./models -
Qwen3-TTS is a git submodule pinned to upstream commit
022e286:git submodule update --init --recursiveThe
tts_server/web-demo backend includes a local UI customization toqwen_tts/cli/demo.py. It is preserved as a patch — reapply it after checking out the submodule:cd Qwen3-TTS && git apply ../scripts/qwen3_tts_demo_umbra_patch.patch -
Environment: copy/keep
.env(contains secrets) and setUMBRA_TTS__*model paths undermodels/.
Book projects (e.g. DealHunterShip_...) are committed separately under their
own project directories and are not part of this program repository.