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How to Isolate Instrument Stems from a Song

Stem separation lets you pull a song apart into its individual instruments, drums, bass, guitar, piano, vocals, without a multitrack session or the original project files. Here is how to do it, what the results sound like, and where the technique genuinely falls short.

Last updated August 2026 · 7 min read

What stem separation actually does

When a record is mixed and mastered, all the instruments are combined into a single stereo file. Stem separation attempts to reverse that process, to unmix the mix. It is a hard problem, and for a long time the results were poor enough that serious musicians ignored it entirely.

The situation changed as transformer-based models were applied to the task. JamScore AI uses dedicated band-split deep neural architectures trained specifically for music source separation. It processes the frequency content of your track and assigns each time-frequency bin to the most likely source: vocal, drum, bass, guitar, piano, or a catch-all "other" category. The result is six independent audio streams, each one containing predominantly (though not exclusively) that instrument.

What you do with those streams is up to you, listen and study, export for remixing, loop for practice, or feed them into a transcription tool.

Step-by-step: isolating stems in JamScore AI

1. Upload a high-quality audio file

   Drag an MP3, WAV, M4A, or OGG file onto the upload area (or click to browse). Files up to 10 minutes long are supported. Use the highest-quality version of the track you have, a WAV from a purchased download will give the model more spectral detail to work with than a heavily compressed stream rip. Six-stem separation requires a Pro or Studio plan; the free tier produces vocals and instrumental only.

2. Wait for the six-stem separation to complete

   The model runs locally in your browser using WebAssembly. Expect 30 seconds to two minutes depending on the track length and your device. A progress bar tracks the processing; the tab can be left in the background. Once it finishes, the studio mixer loads with six labelled channels: Vocals, Drums, Bass, Guitar, Piano, Other.

3. Solo the stem you want to study

   Press the Solo button on a channel to mute all others and hear only that instrument. Press it again, or click Solo on a different channel, to switch focus. This is the fastest way to audition what the model has produced before you commit to exporting anything.

4. Adjust EQ and volume to taste

   Each channel has a three-band EQ (low, mid, high) and a volume fader. If you are isolating a bass guitar stem and want to hear the low fundamental more clearly, boost the low band. If a guitar stem has an unpleasant boxy mid-range character from bleed, cut the mid. These are non-destructive, they only affect playback and export from this session.

5. Use A/B loop markers to drill a section

   Set loop in and out points around a bar, a fill, or a specific chord change. The section will repeat continuously, which is useful for careful listening, transcription, or, if you are a vocalist, practising your own part over the backing.

6. Export stems as WAV

   Click the download icon on each channel to export that stem as a lossless WAV file. You can export all six stems individually, then import them into any DAW (Ableton, Logic, Reaper, GarageBand) for further editing. There is no MP3 export, WAV only.

What each stem contains

Vocals

Lead and backing vocals, any vocal ad-libs, and sometimes close-mic'd spoken word or rap. Choir pads and vocoder parts usually appear here too, since their spectral shape resembles a human voice.

Drums

The full kit: kick, snare, hi-hats, toms, cymbals, and percussion. Drum machine patterns are generally well-separated. Handclaps and shakers sometimes split between Drums and Other depending on how they were produced.

Bass

Bass guitar (both DI and amp-miked), synth bass, and 808 sub patterns. In hip-hop productions with a very sub-heavy 808 that also contains pitched melody, the model may split part of it into the Piano channel, 808s with significant harmonic content look spectrally similar to a bass piano note.

Guitar

Electric and acoustic guitar. Heavily distorted rhythm guitars sometimes share spectral space with keyboards, particularly if both are mid-heavy. Expect some bleed in dense rock mixes with wall-of-guitars production.

Piano

Acoustic piano, electric piano, and many keyboard sounds. Clean-toned synth pads with slow attacks can end up here as well. The piano/guitar boundary is one of the trickier separations, particularly when both instruments occupy the upper-mid range simultaneously.

Other

Everything that does not fit cleanly into the five categories above: strings, brass, choir beds (non-vocal), synthesiser leads, sound design, effects, and any acoustic instrument the model cannot reliably classify. In orchestral or cinematic music, a large portion of the arrangement will land here.

Transcribing an isolated stem

One of the most practical uses of a clean stem is transcription. Once you have isolated the bass guitar, for example, you can send that stem through the MIDI transcription tool to get a playable MIDI part, standard notation, or guitar/bass TAB. The same applies to piano parts, drum patterns (drum score output), and melodic stems.

This is a far more reliable route to accurate transcription than feeding the full mixed audio into a transcription tool, the model has much less interference to deal with when the target instrument is already isolated. See the companion guide on converting a song to MIDI and sheet music for the full transcription workflow.

If you have printed sheet music you want to synchronise with your separated stems, the optical music recognition feature can convert a PDF or image scan to MIDI and MusicXML, useful for following along with the score while the isolated stem plays.

Practical use cases

• Learning by ear. Isolate the bass to transcribe a walking bassline, or the piano to work out voicings you cannot quite hear in the mix.
• Removing one instrument. Mute only the guitar and keep everything else, useful if you want to practise your own guitar part against the original rhythm section. See also the guide on removing vocals from a song for the vocal equivalent.
• Remixing. Export individual stems and reimport them into a DAW as individual tracks. You now have a rough multitrack you can rearrange, pitch-shift, or time-stretch.
• Checking a mix reference. Producers sometimes import a commercial track, separate it, and solo individual stems to analyse how a professional mix engineer treated the bass or drums. The model artefacts are a known limitation, but the broad picture is usually informative.
• Drum practice. Loop the drum stem from a song you love and practise playing along. Then mute the drums and play over the rest of the band, harder, but closer to a real-world playing situation.

Frequently asked questions