Sound for B-Roll: Natural Sound, Music and Voiceover
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Quick answer
Your voice usually leads, so keep B-roll audio low or muted under speech. Let natural sound (a pour, a click, footsteps) peek through in pauses, duck music beneath your voice, and keep a few seconds of room tone to smooth edits.
Instagram, Facebook & TikTok · Only use clips you own or have permission to use.
Key takeaways
- Voice first: lower B-roll audio under speech.
- Natural sound adds realism in pauses.
- Duck music under voice.
- Room tone hides audio gaps.
- Only use music you have the right to use.
On this page
Three layers
- Voice: the story.
- Natural sound (nat sound): the real sound of the B-roll.
- Music: mood and pace.
Natural sound
A short burst of real sound makes B-roll feel alive: the hiss of an espresso machine, keys typing, a door closing. Let it rise in gaps between sentences, then dip under your voice. It also works brilliantly as a J-cut lead-in. (J-cuts and L-cuts)
Music
- Pick music that suits the mood and pace.
- Lower ("duck") it whenever you speak, then let it rise in pauses.
- Use only tracks you have the right to use: platform libraries, licensed tracks or your own. (Footage and license types)
Voiceover over B-roll
If you narrate over B-roll, record in a quiet, soft-furnished room close to the mic. Some creators use AI voice tools such as ElevenLabs for narration; check the tool's terms for commercial use.
Room tone
Record 10–20 seconds of silence in your recording space. Drop it under cuts to fill gaps so the background doesn't suddenly vanish.
Levels
- Keep your voice clear and consistent.
- Nat sound and music sit noticeably lower under speech.
- Check on phone speakers and on headphones.
Common mistakes
- B-roll audio fighting your voice.
- Music too loud.
- Silent gaps where room tone is missing.
How VDOHBoost fits
Clips from VDOHBoost come as MP4s from your own Instagram, Facebook or TikTok posts, so you can decide in your editor whether to keep their original sound or mute it.
In VDOHBoost the flow is Paste → Trim → Done:
- Paste a link to your own clip
- Tick the rights checkbox
- Press "Get clip" and wait for loading
- Trim the clip on the "READY TO TRIM" screen
- Choose a crop: Original, 9:16, 1:1 or 16:9
- Export, then "Download MP4"
VDOHBoost exports up to 720p.
Get a clip from your own post →
FAQ
Should B-roll have sound?
Often yes, but quietly. Keep it low or muted under speech and let natural sound come up in pauses.
What is natural sound in video?
The real sound recorded with a shot, like footsteps or a pour. It adds realism to B-roll.
What is room tone?
A recording of the background sound of your space, used to fill gaps between edits so the background stays consistent.
How loud should music be under voice?
Clearly below your voice. Lower it while you speak and raise it in pauses.
Can I use any song under my B-roll?
No. Use music you have the right to use, such as a platform library, a license or your own work.
Summary
Let voice lead, bring up natural sound in pauses, duck music, use room tone and check levels on a phone.
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