How to separate the stems of a song: vocals, drums, bass and instruments
3 min read · Updated
Isolating the vocal of a song, muting the drums to practice or pulling out a bass line: stem separation, long impossible, has become an everyday tool thanks to neural networks. Here is what it can really do, its limits, and how to use it right inside your DAW.
In short
- Start from the best possible source (WAV or FLAC rather than MP3).
- Choose 4 stems (vocals, drums, bass, other) or 6 (guitar and piano too).
- Solo each stem to spot artifacts.
- Touch up lightly (EQ, gate) rather than chasing perfection.
- Check the rights before releasing anything.
What stem separation does
A mixed song is a single stereo signal: the original tracks no longer exist in it. A separation model has learned, from thousands of songs, to recognize what belongs to a voice, a drum kit or a bass, and rebuilds an estimate of each track.
The result is not the studio's original track but a reconstruction that is often stunning. The denser the mix (distorted guitars, long reverbs, doubled vocals), the more traces of other instruments remain in each stem.
What it is for
Remixes and edits: get an a cappella or an instrumental for a remix, a mashup or a DJ edit. Practice: mute the drums or the bass to play along, slow down a passage to transcribe it. Sampling: isolate a piano phrase or a drum loop. Mix analysis: hear how a reference's bass and kick share the low end.
It also helps with repairs: turning down drums that are too loud on an old recording, or recovering a vocal whose instrumental tape is lost.
4 or 6 stems?
The classic 4-stem split (vocals, drums, bass, other) is the most robust: each category is well defined. The 6-stem mode also isolates guitar and piano, useful for songs where those instruments carry the harmony; it takes longer to compute, and the "other" stem gets cleaner.
NAUPLY Stems offers both, and goes further: 2 tracks (vocals + instrumental), 4, 6 (plus guitar and piano), then 8 and 10, which also split the drums, with per-stem volume, solo and mute, all automatable.
Getting the best separation
Source quality matters: a WAV or FLAC gives cleaner stems than a compressed MP3, whose artifacts get amplified by separation. Avoid live versions recorded on a phone: the room's reverb sticks to every stem.
Solo each stem. Typical flaws: a vocal "s" leaking into the drums, a metallic hiss in the highs, ghost kick drum hits in the bass. A little EQ, a light gate or a fade often fixes most of it; in a full mix, these flaws usually disappear.
Separating inside your DAW, without uploading your songs
Many separation services work online: you upload the song, you wait, you download the stems. As a plugin, everything happens in the project: NAUPLY Stems separates in the background on your machine, locks the song to the project tempo and exports the stems as WAV. The models are installed with the plugin, nothing is downloaded, and your songs never leave your computer.
A disk cache avoids recomputing a song that was already separated: reopen the project and the stems are there.
Going further: analyzing a reference mix
Separating a reference lets you measure how it is built, stem by stem: vocal level against the drums, instrument width, bass dynamics. That is the idea behind Transplant Master, in development: it separates the reference, captures each stem's DNA and compares it with your mix. For an overall comparison on the master bus (loudness, spectrum, width), Reference Match does the job without separation.
What about copyright?
Separating a song to practice, study it or work on it at home is private use. Releasing a remix, an edit or a sample taken from a protected song requires permission from the rights holders (label, publisher), like any sample. When in doubt, work on your own songs or on officially released stems.
Frequently asked questions
- Can you get a perfectly isolated vocal?
- Rarely 100%: some reverb or sibilance from other instruments often remains. For a remix, the result is usually very usable, especially once placed in a new mix.
- Does separation work offline?
- With a local plugin like NAUPLY Stems, yes: computing happens on your computer, and only the initial model download and the license check (every 3 months) need a connection. Online services send your song to their servers.
- How long does a separation take?
- From a few seconds to a few minutes depending on song length, the chosen mode and your computer's power. As a plugin, playback stays smooth while it computes.
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