Narration, Music, and Sound

fluos generates audio as part of the build. You do not upload a voiceover or license a track — you describe what the video needs and it is produced in place.

The three kinds of audio

Music is generated instrumental-only, so it never fights with narration.

Narration changes how the video is cut

This is worth understanding before you ask for a voiceover. When a video is narrated, the narration becomes the master clock — scenes are timed to the script rather than to a fixed beat grid. One idea per scene, headlines stay short, and visuals have to keep moving while the narration continues.

That is also why narrated explainers are held to a stricter motion standard. A scene that fades in and then sits still for eight seconds of voiceover is the exact failure fluos is designed to catch, so it will rework it rather than ship it.

If you want narration layered over a fast promo cut instead, say so — "keep the beat-driven pacing, just add a voiceover on top" — and fluos treats it as a promo rather than an explainer.

Writing the script

You have two options:

• Give fluos the script. Paste it in and ask it to narrate exactly that. Best when the copy is approved.
• Let fluos write it. Describe the message and audience. Best when you are still exploring.

Narrate this with the following script, word for word:
"Billing used to take an afternoon. Now it takes a minute…"

Voice

fluos picks a narrator that fits your brief — a warm storyteller for a brand film, an energetic voice for a paid social ad, a steady broadcaster for an announcement. The choice appears on the storyboard card and stays the same for follow-up edits until you ask for another.

You can steer it in plain language: by name, or by describing what you want.

Use the voice "Matilda" — knowledgeable and upbeat.

A calm, older male voice with a British accent.

Some of the voices you can ask for by name:

There are a few more, including gender-neutral and character voices. Describe what you need — gender, accent, age, or feel — and fluos chooses the closest match.

Captions

Ask for captions and fluos transcribes the generated narration at word level, so captions land in sync rather than being timed by hand.

Add captions synced to the voiceover. Bold, centered, one line at a time.

Adjusting the mix

Ask in chat to lower music under narration, fade a track, adjust EQ, or add compression. Mixing edits reuse existing audio and preserve its timing. Ask explicitly for a new voiceover or track when you want the source regenerated.

Audio in exports

Audio is included in MP4, WebM, and MOV / ProRes exports. GIF and PNG sequence exports have no audio. MP4 provides the widest playback compatibility.

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