The six parts
| Part | What it holds |
|---|---|
| Vocals | Lead and backing voices. |
| Drums | Kit and most percussion. |
| Bass | Bass guitar, upright bass, synth bass. |
| Guitar | Acoustic and electric guitars. |
| Piano | Piano and similar keyboards. |
| Other | Everything else, such as strings, horns, synths and effects. |
The model was trained to recognise what each instrument sounds like. It rebuilds each part from the finished mix; it doesn’t have the original multitrack recording.
Why some sound leaks between parts
Instruments that play the same notes in the same range share frequencies, and the model has to guess which part each sound belongs to. You may hear:
- a faint trace of the vocal in the guitar part (often called bleed);
- a watery or “phasey” sound on a sustained note;
- an instrument the model doesn’t know, such as an organ or a sitar, split between two parts or placed in Other.
What gives the best results
- Clean source audio. Lossless or high-bitrate files separate better than low-quality or re-recorded audio.
- Studio recordings. Live recordings with crowd noise or room reverb are harder.
- Clear arrangements. Dense, heavily processed mixes leave more overlap.
What you can do about it
You can’t re-run separation with different settings, but the mixer helps: lower a part rather than muting it, or use a mixer preset that highlights one instrument (the mixer). See also separated parts sound wrong.
