Before you begin
  • Use authorized recordings. A new mix does not change music rights.
  • Start with 2 stems, then mute or lower Vocals.
  • Check the chorus and quiet gaps before exporting.

Aim for a useful practice mix

A backing track for singing practice does not always need complete silence where the singer was. A faint guide vocal can help with entrances and phrasing. Conversely, a vocal estimate that sounds clean by itself may leave its reverb or harmony doubles in the accompaniment. Decide whether you want a quiet guide or the strongest available removal.

Build the first version

  1. Open a short authorized excerpt in Stemix and choose 2 stems.
  2. When processing finishes, play both tracks to confirm the recording.
  3. Mute Vocals to hear the accompaniment. Then bring a little vocal back if it makes the practice version more useful.
  4. Check a verse, a busy chorus and the spaces between phrases.
  5. Choose Mix in the save menu. That preserves your chosen balance. Save the accompaniment alone when you want the unadjusted estimated backing track.

Listen for what disappeared with the voice

Distorted guitar, sustained lead instruments and vocal-like synthesizers can overlap with the patterns a vocal model recognizes. Listen for a weakened lead line or a hole in the middle of the arrangement. If removing all vocals makes the accompaniment distracting, use a quieter guide mix rather than repeatedly processing the same damaged result.

Backing vocals and vocal reverb do not necessarily follow the lead singer into the same output. Check on the speakers or headphones you will actually practise with. If you will play the track through a mono device, check that playback too; stereo width can hide an imbalance that becomes obvious when channels are combined.

Choose a practical deliverable

WAV is useful if you will edit or adjust levels again. MP3 is a smaller copy for routine practice. Stemix exports at 44.1 kHz stereo; WAV is 16-bit PCM and MP3 uses 320 kbps. Those settings do not recover detail already missing from a source recording.

Keep the original audio and a note of your model choice. If you later want a different balance, reopen the browser’s local history while it is still available. An exported mix does not retain editable faders.

Separation does not supply a licence

Before posting, distributing or performing with the result, check that you have the necessary permission for your intended use. Stemix processes audio you provide; it does not grant rights in a song or recording. This workflow explains the controls rather than deciding whether a particular use is permitted.

This guide describes the current product controls and implementation. Separation results depend on the recording, device and model; examples are not quality guarantees.

Further reading: Spleeter · Web Audio API · How the tools work