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mobiCut Docs Release 2026-11-05.1
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Add a soundtrack

Put music (or any audio file) under the video. You can add several, one after another or overlapping.

Add a soundtrack

  1. Move the playhead to where the music should start.
  2. Tap Add, then Soundtrack at the pointer.
  3. Pick the audio file.

The track starts at the playhead's place in the finished video (at the very start if the playhead is at the end). A soundtrack lane appears under the overlay track: one green chip per track, with ♪ and the track's name. Overlapping tracks stack in the lane and play together.

The editor with a picture segment, a muted segment, two videos, and the soundtrack lane with two tracks under the texts.
The soundtrack lane (marker 4) under the texts. Marker 5 is Add.

A soundtrack belongs to the finished video's timeline: it stays at its place when you split, delete or speed up the video under it. Whatever runs past the end of the video is cut off. A chip turns red when the track starts after the video ends, so nothing of it would play.

Track settings

Tap a track's chip.

Soundtrack dialog: start and length, Start at the pointer, Sound Mix or Replace (selected), Volume 80 %, Fade in 2.0 s, Fade out 3.0 s, Remove soundtrack.
Setting What it does
Starts at … · plays … Where it starts in the finished video, and how long it actually plays
Start at the pointer Moves the track to start at the playhead
Mix Plays together with the video's own sound
Replace Mutes the video's sound while this track plays (its chip says ♪ only)
Volume 0–100 %, in 5 % steps
Fade in / Fade out 0–10 s each, in 0.5 s steps
Remove soundtrack Takes it out (Undo brings it back)

Tap Save to apply.

  • Fades are each at most half of the part that plays. The fade-out ends where the track ends, which is the end of the video when the track is cut off, so a long song fades out nicely with the video.
  • With Replace and a fade-in, the video's sound fades out as the music fades in, and comes back the same way at the end.
  • Fades at the start or end of the video (transitions) fade the video's own sound, not the soundtracks; use the track's own fades for those.

The preview plays the soundtracks along with the video. Soundtracks are in both editions.