VOX Factory
AudAi · Voice & Language
VOX Factory is an online vocal synthesizer from AudAi that turns MIDI notes and lyrics into sung vocals in English, Korean, and Japanese, with licensed voices you can release commercially.

About VOX Factory
What Is VOX Factory
VOX Factory is an AI vocal synthesizer that runs in a browser and as a desktop app for Windows and macOS. The singing voice synthesis engine takes MIDI and lyrics, then returns a performance you can edit note by note. You bring the melody as MIDI, type the lyrics under each note, and the engine sings it back with a voice from its roster. No recording booth, no session singer, no scheduling.
The company behind it is AudAi, a Korean voice AI firm. That origin explains the voice list: most of the built-in virtual singers are K-pop, rock, and R&B characters designed for Korean and Japanese releases, and the engine handles both languages natively. English was added later and now works in the same project file, so a single phrase can switch language mid-line.
The practical draw is licensing. Every voice is contracted from a real singer, and AudAi states that songs you make belong to you, with commercial release on streaming platforms allowed. The catch is narrower than it sounds: voices can't be used to train other AI models, can't be resold as anything other than music, and one account serves one person.
Getting Started
- Create an account at voxfactory.app and pick the free Basic plan to test the studio.
- Open a project, then import a MIDI file, draw notes on the piano roll, or start from one of the demo projects.
- Type lyrics under the notes and choose a vocal. Check the range marker before you commit, since each virtual singer covers a different register.
- Shape the performance with pitch curves, intensity, vibrato, and bend controls, then render the section you changed.
- Export the audio, or open VOX Link inside your DAW to keep tempo and playback in sync while you arrange.
Product Information
A quick look at VOX Factory's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- K-pop and J-pop demo makers
- Singer-songwriters without a vocal range for their own songs
- Cover and remix creators
- Game and app audio teams
Tasks
- Building a guide vocal for a producer or arranger
- Testing a topline before writing the full song
- Turning a hummed idea into editable notes
- Localizing a chorus for a Japanese or English release
Scenarios
- A weekend demo that needs a finished-sounding vocal
- A producer working inside a DAW all day
- A small studio quoting a jingle
Key features
Three-language singing generation
VOX Factory sings in English, Korean, and Japanese, and the engine allows all three inside one phrase. Most AI vocal generators lock a project to one language, which forces a second file for a bilingual chorus. You write the lyrics in the language you need under each note, so a Korean verse can hand off to an English chorus without a second project. Pronunciation is handled per syllable, which is why the note timing matters more than the spelling.
Drawable pitch tuning
The piano roll includes a pitch curve you can draw node by node. Small moves clean up a flat note, larger shapes create legato slides or a controlled vibrato that no preset will match. Partial rendering re-generates only the notes you edited, so a fix takes seconds instead of re-rendering the whole track.
Four performance controls
Intensity, vibrato, pre-bend, and post-bend sit on one panel and change how a note is attacked and released. Intensity pushes a line from soft to belted, bends imitate the scoop a singer adds before landing on pitch. Four sliders sound limited until you hear how much of a vocal's character lives in those four moves.
Voice to MIDI
Record or upload a vocal take and the tool extracts melody and lyrics into editable MIDI. The result is clean enough to move to another voice or another tempo, which makes it a fast way to capture an idea hummed into a phone. It also helps when you inherit a session from a collaborator and only have the audio.
Voice Changer
Voice Changer swaps the character of your own singing while keeping your phrasing and timing. Pitch and intensity controls let you push the result toward a deeper or brighter timbre. For songwriters who can sing but want a different texture on the demo, this avoids rebuilding the part note by note.
VOX Link DAW sync
VOX Link is a plugin that connects the app to your DAW and keeps playback, tempo, and time signature in step. Audio flows into the arrangement while you work, so you can judge a vocal against the full mix rather than in isolation. Projects also live in the cloud, and MIDI plus UFData import keeps parts movable between tools.
Pros and cons
Pros
- Voices are licensed from real singers, and AudAi states that songs you create belong to you, including commercial releases.
- Korean, Japanese, and English work in the same project, with language switching inside a phrase.
- Pitch drawing, four performance controls, Voice to MIDI, and Voice Changer cover most of a vocal production chain in one window.
- A free Basic tier and a one-time Character Ownership option give two ways to start without an open-ended subscription.
- Browser access plus native Windows and macOS apps mean the same project opens on a laptop or a studio machine.
Cons
- Only three languages are supported, so artists working in Spanish, Mandarin, or Portuguese have no native option here.
- Projects and rendering depend on a cloud connection, which is a problem on a flaky studio network.
- Custom voice cloning is listed as coming soon, and API access is limited to the Business plan, so small teams can't automate renders yet.
- The piano roll assumes MIDI literacy. Producers coming from audio-only workflows will spend the first session learning note editing.
Frequently asked questions
There is a free Basic plan with limited vocals and cloud projects. Essential and Artist are paid subscriptions billed monthly or annually, and Artist includes the full vocal library plus a 7-day trial. Individual voices can also be bought outright through Character Ownership.
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