NEUTRINO

Overview

NEUTRINO is an AI vocal synthesizer for musicians who work from sheet music, lyrics and melody. It suits composers and audio producers seeking a free way to create a sung part from written material, but it is not a tool for vocal-input conversion or making a custom voice library.

Its workflow is unusually rooted in notation: the system estimates vocal timing, pitch, voice quality and breathiness from sheet music, then synthesizes the result with a vocoder. That makes it a practical fit for composing vocal lines without recording a singer, while users expecting to transform an existing vocal should look elsewhere.

Getting started means downloading NEUTRINO and adding a voice library. The project says its models draw on recordings made with performers’ permission or audio released by public institutions, rather than existing pretrained models.

Key features

Voice generation and control

Muon offers voice retakes, adjustable quality and processing speed, and advanced, standard and elements modes. These controls give users options to refine a vocal or trade processing quality for speed. Advanced and standard output is 48 kHz, 16-bit mono WAV; elements output is 24 kHz, 16-bit mono WAV. The lower-resolution elements export may suit a lighter workflow, while users needing the higher stated resolution should choose advanced or standard.

Voice libraries and limits

The project describes its models as reproducing vocal quality, singing style and individual quirks from performers’ recordings. NEUTRINO does not offer voice cloning, and users cannot currently build their own voice libraries with a released framework. That keeps the available workflow focused on the provided voice libraries rather than custom voices.

Commercial use and distribution

NEUTRINO permits ordinary audio-file use, including music production, without a restriction imposed by the software itself. Character-specific terms also apply and vary by character and asset type, so producers should check the terms for the voice and materials they use. Embedding the software or using generated audio inside an application requires separate permission. The FAQ names JOYSOUND Uta-Suki Music Post, BIG UP!, TuneCore Japan and Dwango’s music monetization service as supported distribution services as of May 2025.

Processing requirements and support

The FAQ says about 4–6 GB of GPU VRAM is sufficient, while some processing may run out of memory below 4 GB; CPU processing modes are also described. Users with limited graphics memory may need to rely on CPU processing or accept that some work can exceed available memory. Questions that remain unresolved can be directed to the project.

Pricing

NEUTRINO — free. The free plan covers general music and audio production, making it a strong option for composers who want to create vocals from sheet music without a software fee. It does not grant permission to embed NEUTRINO or use generated audio inside an application; that requires separate permission. Character-specific terms also apply to ordinary audio-file use. No paid plan is specified.

Platforms

NEUTRINO is available for Linux, macOS, Windows and the web. The download workflow calls for installing NEUTRINO and adding a voice library, so users should expect a setup step beyond opening the software.

Who it's for

NEUTRINO is best for musicians and producers who compose with lyrics and melody and want synthesized singing without recording vocal input. It is less suitable for users who need voice conversion, user-created voice libraries or permission-free integration into an application. The inability to create a custom library also limits projects that depend on a distinctive, user-built voice.

Pros and cons

Pros

• Free for general music production: users can create and use ordinary audio files without a software fee or a restriction from NEUTRINO itself.
• Written-music workflow: it synthesizes singing from sheet music, lyrics and melody rather than requiring vocal input.
• Multiple processing choices: retakes, quality and speed controls, and three modes give users flexibility over generation.
• WAV output: advanced and standard modes produce 48 kHz, 16-bit mono files, with a 24 kHz elements option.

Cons

• Application use needs separate permission: free use for music production does not cover embedding the software or placing generated audio inside an application.
• Character terms vary: commercial audio use depends in part on the specific character and asset type.
• No released custom-library framework: users cannot create their own voice libraries through the project.
• Some processing can exceed low GPU memory: the FAQ warns of possible out-of-memory issues below 4 GB of VRAM.

Alternatives

Browse AI Singing Voice Generators to compare more options. Consider Revocalize AI instead if you want a freemium service with a stated allowance of 5 conversion minutes per month and one Starter AI voice on its free plan.

Kits AI may suit readers who want a web or API option with 15 conversion minutes on its free plan, though that plan includes zero voice slots and zero download minutes. Choose SoulX-Singer if a self-hosted option with code and model weights under Apache 2.0 better fits your work.

Audimee is worth considering for web-based conversion with 15 free conversion minutes, 11 royalty-free voices and MP3 downloads, but its free plan is for personal use only. LyricToMelody AI may fit a lyric-first drafting workflow: its free Starter plan begins with 20 credits and offers MP3, WAV and PCM export.

For a self-hosted project where users prepare their own data and assets, consider DiffSinger, an Apache-2.0-licensed repository requiring Python 3.10 or later. Musicful is another freemium option, available on Android, iOS, web and API. Choose ACE Studio if you want a paid desktop suite; its Artist plan is $16.58 a month, billed yearly, with rent-to-own access after two years.

Verdict

Choose NEUTRINO if you compose vocal parts from written music and want a free synthesizer with several generation modes and WAV output. Its strongest case is cost-free use for ordinary music production; look elsewhere if you need vocal conversion, a custom voice library, or an application-ready license without separate permission.