ENUNU

What ENUNU is

ENUNU is a Windows plugin for UTAU that brings NNSVS singing voice models into a UTAU workflow. Choose an ENUNU model or a folder containing an NNSVS model, select notes, and run the plugin to generate a WAV file. Its extensions cover changes to UST lyrics, score or timing labels, and acoustic parameters such as f0. The voicecolor_applier extension maps expression suffixes such as あ強 to model flags such as Power. For pitch editing, f0_feedbacker sends synthesized pitch back into the UST, while f0_smoother smooths steep pitch changes.

Models need an enuconfig.yaml file in their folder, and question_path must point to and include the file used during training. ENUNU can use ordinary NNSVS models; the ENUNU Training Kit is recommended for somewhat more stable results. The kit creates NNSVS or ENUNU models from UST, LAB, and WAV singing data, and lists Windows 10 and 11 as operating environments. ENUNU is open source under the MIT License, which permits commercial use subject to its conditions. The license provides the software without warranty. The README links to an installation and usage article on note.com.

Who it suits

ENUNU suits Windows UTAU users who want to use NNSVS singing voice models as UTAU voicebanks. It may also fit users who want extensions for adjusting UST text, timing, acoustic parameters, or synthesized pitch.

Limits

Lyrics with multiple hiragana characters in one note are unsupported, except for gemination (っ). A model folder must include enuconfig.yaml, and its question_path must point to and include the file used in training.

Getting started

1. Drag the ENUNU ZIP file into the UTAU window to install the plugin.
2. Choose an ENUNU model or a folder containing an NNSVS model in UTAU.
3. Check that the model folder includes enuconfig.yaml and that question_path points to and includes the training file.
4. Select notes in UTAU and run the plugin to generate a WAV file.

Verdict

Choose ENUNU if you use UTAU on Windows and want to work with NNSVS singing voice models, with extensions for UST and pitch adjustments. Look elsewhere if your lyrics require multiple hiragana characters in one note, outside the special handling for っ.