How to Split a Song into Stems Online: Vocals, Bass, Drums

Need an instrumental for a live show, an acapella for a remix, or an isolated bass line to learn a part? All of that can be made from an ordinary finished mix — no source files, no DAW. Here is how to split a song into stems online in Magic Master and what to honestly expect.

What stems are and what you get

A stem is an isolated layer of the mix. Our separation returns four:

1. Vocals — all vocals including backing;
2. Drums — drums and percussion;
3. Bass — the bass line;
4. Other — everything else: guitars, keys, synths, strings.

The sum of the four stems is practically equal to the original track — mute and mix them in any combination. Vocals + Other without Drums/Bass gives a "bed", Drums + Bass + Other is a classic instrumental, Vocals alone is an acapella. You can then bring the acapella to an even level with the Dry vocal preset — that is vocal mastering online, with no reverb and no added colouration.

How it works under the hood

The separation runs on Demucs (Meta AI research) — a network trained on thousands of tracks with known sources. It "hears" a mix roughly the way an engineer does: it recognizes the timbre of a voice, the attack of a kick, the character of a bass. Processing happens on our server; your file is not shared with third parties or published.

In our measurements the sum of stems reconstructs the original at about 28 dB SNR — a strong result for neural separation of a finished mix.

Step by step

1. Open the app and upload a track (WAV, FLAC, MP3 — up to 200 MB).
2. In the PRO modules block press "Split into stems · 1 token".
3. Wait for processing — about 4× the track length (a 4-minute song takes around 17 minutes). If the server is busy, you see your queue position and start estimate. You don't have to stay on the page: the archive is kept in your profile for 24 hours.
4. The archive downloads automatically; with Telegram linked it also arrives in your chat.

The token is charged only after successful separation — a failure costs nothing.

Honest about quality

Neural separation is not the original studio multitrack:

• dense mixes (wall of sound, heavy compression) may show light "musical noise" in quiet spots of stems;
• reverb "glued" to the vocal at mixdown will partially stay in the vocal stem;
• a full rebuild of a track needs source files — stems are for instrumentals, remixes, sampling and learning.

More on artifacts — in AI separation artifacts explained.

What to do with stems next

• Instrumental/karaoke — mute vocals, mix down the rest.
• Remix — take the vocal or the rhythm section as material.
• Stem mastering — process the layers separately: we also offer stem mastering.
• Arrangement study — listen to parts in isolation.

Try it on your track: magicmaster.pro/stems-separation.