NetEase Youdao · Voice

Confucius4 TTS

Commercial use permittedApache License 2.0

Permissively licensed and multilingual. The card advertises unconstrained zero-shot voice cloning and cross-lingual voice transfer without a reference transcript. No consent requirement, AUP or output disclaimer could be found on it. That absence is not a grant of permission.

netease-youdao/Confucius4-TTS on Hugging Face audio.cpp

The licence

Summarized from the linked source documents, last checked 25 August 2026. Every claim links to its source; anything unconfirmed is marked unconfirmed.

Apache License 2.0

Commercial use permitted

Apache-2.0. Commercial use is permitted, with no revenue cap and no research-only carve-out. Keep the copyright and licence notices when you redistribute the weights.

What about the audio you generate?

Apache-2.0 asserts nothing over output. No acceptable-use policy, consent requirement or output disclaimer was found on the model card. For a model that advertises unconstrained voice cloning, that is a gap, not a permission. Consent for any voice you clone is your responsibility.

Correction to the shipped catalog: The shipped catalog says "Unknown". It is Apache-2.0, per the model repo and the conversion table.

Based on the licence text as of the date below. Licences change; the links carry the authoritative version.

Specs

Transcribed from the shipped catalog, audiocpp_models_catalog.json — that file is authoritative if a number here disagrees with it.

Vendor: NetEase Youdao
Catalog id: audiocpp-confucius4-tts
audio.cpp loader family: confucius4_tts
Can do: Text to speech
Weights repo: audio-cpp/audio.cpp-gguf
Weights file: Confucius4-TTS-GGUF/confucius4-tts-orig.gguf
Account needed to download: No
Max clip length: 60s
Sample rate: 44.1kHz mono
Approx. VRAM: 9.3 GB
In the picker by default: No — opt in from Settings
Run end-to-end here: No — catalogued, not tested here

Getting it

There is no per-model install. One native binary runs all of these, so getting a model is a download of its weights and nothing else — no virtualenv, no torch pin, no CUDA wheel to match against your driver.

From the CLI

soundbox model install audiocpp
soundbox pull audiocpp-confucius4-tts

The binary is fetched from audio.cpp's GitHub releases the first time you ask for it and cached under your own data directory. Soundbox ships no native binaries and vendors none.
Weights land in <models dir>/audiocpp/audiocpp-confucius4-tts/ rather than in the shared Hugging Face cache, so a download stays scoped to the model you asked for.
This one is opt-in: switch it on in the Models page's “Enable more models” section before it appears in the picker.

Worth knowing

~9.3 GB of VRAM, one of the heavier speech models here.
Opt-in and untested here.

Sources

Primary sources: the model's own repository, the project it came from, and the conversion audio.cpp actually downloads. Never invented — an entry with nothing findable says so instead.

Licence details on these pages are summaries of the linked source documents, last checked 25 August 2026. They are not legal advice, and Soundbox is not affiliated with any model's authors — weights download from Hugging Face under the user's own account and terms. Company and model names identify whose work it is, and belong to their owners. The linked licence text is authoritative; commercial use should be checked against it, per model, before anything ships.