How to add sound to an AI video
Three ways to get audio for a generated clip: native audio on supported video models, sound effects and music, and a voiceover, then how to combine them.
Step by step
Check whether the model generates audio
Some video models can generate sound alongside the video: Seedance 2.0, Seedance 2.5, and Kling 3.0 Omni. Turn on Generate audio in the video generator. It adds ambience and effects, not dialogue, and it changes the credit cost.
Add sound effects for key moments
Generate a short effect for each moment that needs one, such as a whoosh or an impact, using the sound effects generator.
Add a music track
Generate a track in the music generator with a feeling and a tempo that suit the clip, at the length you need.
Add a voiceover if the clip needs narration
Write the script, choose a voice and a delivery style, and generate the voiceover.
Combine everything in your editor
Every generation is saved to your history, where you can download it. Bring the video and the audio files into your video editor and mix them there.
Native audio versus separate audio
Native audio is the quickest option because it comes with the clip. Separate sound effects, music and voiceover give you more control over timing and level, and they work with any video model, including those with no audio of their own.
Keep the cost in view
Each audio generation shows its exact credit cost before you run it. Sound effects and music are priced by length and voiceover by character count, so short, tested pieces keep spending down.
Frequently asked questions
Which video models generate audio?
Seedance 2.0, Seedance 2.5, and Kling 3.0 Omni can generate audio natively. The setting adds ambience and effects, not dialogue.
Can I use music and sound effects with any video?
Yes. Audio is generated separately and saved to your history, so you can download it and combine it with any clip in your video editor.
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