FEATURE · AUTO-DUCK
Auto-duck music under speech
Fuse lowers background music automatically when a voice plays, then brings it back when the voice stops. No manual volume keyframes.
Stop drawing volume keyframes by hand
When a video has both music and speech, the music needs to move out of the way. In most editors, that means manually lowering the music every time someone speaks and raising it again when the speech stops.
That works once. It gets annoying fast.
Auto-duck does it automatically. Fuse listens for voice on speech-enabled lanes and lowers the music while the voice is active. When the speech ends, the music returns to its previous level.
How auto-duck works
Auto-duck is powered by sidechain ducking: a common audio technique where one signal controls the level of another. In Fuse, the voice is the trigger and the music is the track being lowered.
You do not need to route buses or set up a compressor manually. Turn on Auto-duck in the music lane, and Fuse handles the connection.
For the underlying audio theory, see the sidechain ducking glossary entry.
Watch the workflow
30-second walkthrough — mic icon marks voice as the duck trigger, wave icon on the music lane enables auto-duck.
Useful when the voice matters
- Talking-head videos
- Voiceover explainers
- Tutorials
- Product demos
- Podcast clips
- Existing videos with speech
- Ads with narration
What makes Fuse's auto-duck different
- One toggle — no manual sidechain routing.
- Works with AI voiceover, uploaded voice, and original video speech.
- Responds to the voice signal instead of fixed timestamps.
- Keeps music present during pauses and lower during speech.
- Built into the same timeline where you edit the video.
By default, Fuse uses short-form-friendly ducking settings designed to keep speech clear without making the music pump aggressively. Advanced controls can expose depth and timing where needed.
Questions, answered.
FAQ
What does auto-duck mean in a video editor?
Auto-duck means the background music automatically lowers when a voice or important audio signal plays. When the voice stops, the music returns. It helps keep speech clear without manual volume edits.
How is auto-duck different from manually lowering the music volume?
Manual ducking means adding volume changes by hand for every speech segment. Auto-duck reacts to the voice signal automatically, so you do not need to draw keyframes for every sentence or cut.
How do I turn on auto-duck in Mubert Fuse?
Open the music lane, find the Auto-duck control, and turn it on. Voice-enabled lanes — such as AI voiceover, uploaded narration, or original video speech — can trigger the ducking.
Does auto-duck work with the original video's audio?
Yes. If your original video contains speech, Fuse can use that speech as the ducking trigger so the background music lowers when the person in the video speaks.
Can I customize the ducking depth and timing?
Fuse includes default ducking settings designed for short-form videos. More detailed controls for ducking depth and timing can be added for users who need finer mix control.
Lower music under voice automatically.
Upload a clip, add music, turn on auto-duck, and keep speech clear without manual keyframes.
Try auto-duck in FuseLast updated
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© 2026 Mubert, Inc.
Your next short is one tab away.
100 credits every month, one free project, no card. Score your first clip in the browser — it takes less than the music hunt.
© 2026 Mubert, Inc.