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You can add background music to your Tella video from Tella’s built-in music library, or upload your own track. You can also preview tracks, adjust the volume, and remove or replace music at any time.
Audio you upload here is background music — it’s mixed in underneath the audio that’s already in your video (your voiceover, screen audio, and so on) and plays quietly behind it. It is not a voiceover or main audio track, and it does not replace your existing audio.Tella doesn’t support importing a standalone voiceover or narration track, or recording a voiceover over an existing clip. To narrate a recording, record your mic at the same time as your screen, or re-record the clip. See Can I combine two separate recordings into one video?.
Background music applies to the whole video, not to a single clip — there’s one background track for the video, and it plays across every clip.

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Open the audio tab

  1. Open your video in the Tella editor.
  2. Select the audio tab.

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Browse and preview Tella’s background music

  1. In the audio tab, browse the background music that is available.
  2. Select a track to preview it.
  3. Click Play to hear how it sounds.
  4. Use the seek control to skip around and preview different parts of the track.
  5. Browse the full set until you find a track you like.

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Add a track to your video

  1. When you find a track you like, select add.
  2. The full track is added across the full duration of your video.

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Adjust the music volume

  1. Use the volume control in the audio tab to make the music louder or quieter.

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Remove or replace the track

  1. To remove the current track, select the remove option in the audio tab.
  2. Add a different built-in track, or upload your own to replace it.

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Upload your own background music

  1. In the audio tab, select upload.
  2. Choose an audio file from your computer.
This is useful if you have branded music, something you created yourself, or a custom track.

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Why does my uploaded audio fade in/out?

Background music is meant to sit gently behind your voice, so Tella shapes it automatically:
  • It fades in at the start and fades out at the end of your video, so the music eases in and out instead of cutting abruptly. This is expected behavior for background music — it’s not a glitch with your file.
  • It’s mixed under your existing audio at the music volume you set, so your voiceover and screen audio stay in front.
If you uploaded a track expecting it to play at full volume as the main audio, that’s why it sounds quiet and fades — the Audio tab is for background music, not for a primary voiceover track.

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How Tella handles track length

  • If your background track is longer than your video, Tella fades it out at the end of the video.
  • If your background track is shorter than your video, Tella loops it so you have music for the full duration.

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Preview your video with music

  1. Click Play to preview the video with your background music.
  2. If needed, adjust the volume until it sounds right.

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Set background music via the API or MCP

Background music can also be set and removed programmatically. Use PUT /v1/videos/{id}/background-music and DELETE /v1/videos/{id}/background-music in the Public API, or the set_background_music and remove_background_music tools in the MCP server.