By Team Hypomnema · Updated October 19, 2026
Mix voice and music, loop a backing track, set its start time and lower music automatically during speech.
Prepare and preview
Add one voice recording and one music recording within the combined two-minute source limit.
Trim both tracks, set their levels and the music start time. Enable looping and music ducking if needed.
Prepare the mix, listen to the encoded preview and download MP3 or WAV.
Limits and output quality
Browser-supported MP3, WAV, M4A, AAC, OGG, FLAC and WebM inputs; mono or stereo only. Up to 20 MB per file, 40 MB and two minutes of source audio combined. Processing runs locally at 44.1 kHz with a cancellable worker. WAV is 16-bit PCM; MP3 re-encoding is lossy, cannot restore missing detail, and may add frame padding or use a lower sample rate at low bitrates. Accessible source metadata is not preserved. Peak normalization is not LUFS mastering or noise removal. The encoder reduces gain if needed to prevent clipping. Shorter recordings are best on phones. Ducking uses short-window voice-track volume with attack, hold and release, not speech recognition. Background noise can trigger ducking. Music loops are simple repeats and may have audible seams. The longest-track option includes the music start offset and cannot exceed two minutes of output.
Try the workflow
Keep your original documents and review the output. You can also browse all guides or contact Team Hypomnema.