- How do I overlay multiple audio files?
- Add each audio file as a track, then drag them along the timeline to line them up. Every track plays at the same time in the export — layer music under a voiceover, stack sound effects, or build a full mix.
- Can I control the volume and timing of each track?
- Yes. Each track has its own volume and can be dragged along the timeline to set when it starts, with handles to trim its start and end — so music can sit quietly under a voice, or an effect can land at just the right moment.
- Can I add background music to a voiceover?
- Add your voiceover as one track and the music as another, lower the music's volume so the voice stays clear, and both play together in the export.
- Is this audio mixer free?
- Yes — mixing two tracks is free with no watermark, and it all runs locally in your browser. Layering more than two tracks at once is a Pro feature.
- How long is the mixed file if my tracks are different lengths?
- As long as the longest one, counted from where it sits on the timeline. A 10-second effect dropped at the 2-minute mark of a 3-minute song gives a 3-minute export; the same effect dropped at 2:55 extends it to 3:05.
- Which format should I export a layered mix as?
- WAV or FLAC if the mix goes back into an editor, because neither adds compression loss. MP3 or AAC for sharing and upload. Mixing already-compressed files and exporting to MP3 compresses twice, which is audible on cymbals and speech.