AI narration guide
Generate the voiceover fast, then direct it like an editor
An AI voiceover generator turns a script into narration in minutes, which is ideal for drafts, explainer tracks, and faceless formats. The difference between amateur and professional output is what happens next: pacing edits, breath control, music balance, and captions timed to the voice. Mellius is strongest in that second half — editing and mixing voice on a real timeline rather than cloning voices.
From the Mellius product team · Updated September 28, 2026
Conspiracy theorists, you may hate this
AI Director
›
Just type what you need
- ›Remove all silent parts
- ›Add bold kinetic captions
- ›Only have Bill Ackman speaking
- ›Cut to highlights only
- ›Add cinematic transitions
- ›Match cuts to the beat
The short answer
Generate narration from your script with a voice tool, then import it into an editor for the real work. Trim pauses, fix mispronounced words by regenerating single lines, duck music under the voice, add timed captions, and export with loudness to platform targets. Mellius handles the editing and mixing half on a reversible timeline you control.
Line-level control
You can regenerate or re-record a single sentence without rebuilding the whole narration track.
Mix against picture
Music, room tone, and effects sit under the voice with ducking and level automation, not a single flat render.
Captions from the voice
The final voice track produces accurate timed captions that stay readable over every scene.
Where generated voiceover actually works
Generated narration shines for explainer videos, tutorials, product walkthroughs, and rough cuts where the script still changes daily. Write the script for the ear first: short sentences, one idea per line, and explicit pronunciation notes for brand names and acronyms. Generate at a slightly slower pace than you think you need, because it is faster to tighten pauses on a timeline than to stretch rushed delivery.
Always plan for pickups. Even good synthesis misreads emphasis, numbers, and domain terms, so generate paragraph by paragraph and keep the script lines labeled. In Mellius you can drop the narration on the timeline, cut pauses visually against the waveform, slide lines to match cuts and graphics, and regenerate only the flubbed sentence. Common mistake: rendering a single five-minute take and discovering one wrong word forces a full re-render.
- Write for speech: contractions, short clauses, spoken numbers.
- Generate in labeled chunks so single lines can be replaced.
- Leave half a second of handles around each chunk for clean trims.
- Disclose synthetic narration wherever platform or client policy requires it.
Mix the voice so it sounds finished
A voiceover only sounds professional once the music and picture stop competing with it. Set dialogue as the anchor: level it first, apply light de-essing and room-tone matching if needed, then bring music in underneath at roughly 12 to 20 dB lower during speech and let it lift in pauses. Use volume keyframes or ducking around each phrase rather than one static music level, and high-pass background beds so low-end rumble never muddies consonants.
Finish with captions and delivery checks. Generate captions from the final voice track, split them into one idea per card, and keep them clear of faces and platform overlays on vertical video. Proof the mix on phone speakers and earbuds at low volume — if the narration stays intelligible there, it will survive feeds, classrooms, and commutes. Mellius keeps every one of these decisions as editable timeline state with undo, so a client note like “bring the music down under the second half” is a small revision, not a re-render.
- Level voice first, then fit music and effects around it.
- Duck music per phrase with keyframes, not one flat setting.
- Check intelligibility on a phone speaker before export.
Compare the workflows
| Approach | Best fit | Trade-off to consider |
|---|---|---|
| TTS draft + timeline edit | Explainers and revisions where script changes often | Requires a real editing pass to sound human |
| Recorded human voice | Brand films and emotive narration | Recording and pickup sessions take longer |
| One-click narrated render | Quick internal drafts | Little control over pacing, mix, or captions |
A practical sequence
Put it into practice
- 01
Generate in chunks
Turn the script into labeled narration segments so any line can be regenerated alone.
- 02
Cut and place on a timeline
Trim pauses, align lines to cuts and graphics, and fix emphasis with pickups.
- 03
Mix, caption, export
Duck music under the voice, add readable captions, and export to platform loudness.
Frequently asked questions
Is an AI voiceover generator enough for a finished video?
It covers the narration draft, not the finish. You still need to pace lines against picture, balance music under the voice, and time captions. That editing and mixing pass is what makes synthetic narration sound intentional rather than robotic.
Can Mellius clone my voice?
No — Mellius does not promise voice cloning. Its strength is what happens after you have audio: cutting, arranging, captioning, mixing, and finishing voice against picture on a real editable timeline. Bring narration from any source and direct it there.
How do I fix one mispronounced word?
Regenerate just that sentence with a phonetic spelling or a slower pace, then splice it into the timeline with a short crossfade. Keep chunk boundaries at natural pauses so the pickup blends invisibly. Always re-check caption timing after the swap.
Continue reading
Primary sources
Product capabilities change. These official references support the comparisons above.
Describe the edit. Keep the timeline.
Mellius turns conversational direction into cuts, captions, graphics, motion, color, and sound you can still inspect and change.
Start editing free