Start with a clean source
Upload a WAV, MP3, or M4A, then check the track profile. Shorter files and unclipped mixes are kinder to your browser.
QUICK START
Make your first stem safely
AUDIO WORKBENCH
Pull your track apart.
Create practical stem previews for remixing, practice, and production. Your source audio stays on this device.
- 01Add a track
- 02Choose parts
- 03Preview and export
01 / SOURCE
Bring in a track
Drop an audio file here
or paste a direct audio link
No track selected yet.
Track profile
—Duration
—Sample rate
—Channels
—File size
02 / DESTINATION
Choose your stems
Long tracks can take a few minutes. Keep this tab open while audio is being processed.
02A / QUALITY
Tune the browser pass
Balanced uses smooth multi-stage filters and safe headroom for a practical browser render.
These are signal-processing estimates. A trained ML separator or original multitrack session is still the quality ceiling.
02B / SEPARATION MODE
Choose how to separate
Demucs can produce much cleaner vocals, drums, bass, and other stems, but it needs a server or GPU worker connected to this app.
Not connected yet. Enter your worker URL to enable true ML separation.
Before you connect a worker
- Deploy a Demucs or HTDemucs API that accepts a multipart field named audio.
- Have it return outputs for vocals, drums, bass, and instrumental, plus optional job polling fields.
- Enable CORS for this app and delete uploaded audio and results after processing.
Worker response: return outputs with kind and URL, or a job ID/status URL that eventually returns those outputs.
Privacy: this mode sends the track to your configured worker. The app does not control that server's retention.
Local mode keeps your source audio in this browser.
02B / INSTRUMENT MAP
Identify likely instruments
Scan a short excerpt to find likely keys, guitar, strings, and synth parts. Choose any detected parts to create focused practice stems.
No instrument scan yet.
Ready to process0%
Preparing your audio…
SAFETY CHECK
Browser health check
A quick check catches missing audio support before you spend time rendering.
Audio engine—
File tools—
Saved preferences—
Current source—
03 / OUTPUTS
Your stems are ready
04 / SAMPLE LAB
Make a DAW-ready one-shot
Turn a detected instrument or any finished stem into a short, single-use sample. The app finds a lively moment, trims it, fades the edges, and exports a clean WAV.
Sample ready for your DAW
CLEANER RESULTS
A few studio habits help
- Use a lossless WAV when possible, with no clipping or heavy master limiter; a high-bitrate MP3 is the next best choice.
- Keep the source at its original sample rate and use headphones to check bleed. The exported WAVs include safe peak headroom for mixing.
- Instrument passes are frequency-focused estimates for practice and arranging. They are not isolated multitrack parts and may contain bleed.
- For the highest-quality isolated stems, export from the original multitrack session or use a dedicated ML separator such as Demucs or UVR.
A safe recovery is available