solo-stem-split SKILL.md skillA
solo-stem-split from fortunto2/solo-factory is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add fortunto2/solo-factory/solo-stem-split@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- fortunto2/solo-factory
- Path
skills/stem-split/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Oct 25, 2026
- Size
- 3,212 bytes
- Repository stars
- 18
- License
- MIT
Separate a song or a film's soundtrack into stems (vocals, drums, bass, other) with Demucs, locally, on the Apple GPU when there is one. Use when user says "раздели на стемы", "вытащи вокал", "сделай минусовку", "acapella", "instrumental", "split stems", "isolate the vocal", or needs a voice separated from music in footage, stems for a mashup or sample chops, or drums+bass to detect music. Do NOT use for turning a recording into notes (use audio-to-midi from SuperDuper DSP) or for transcribing…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# stem-split — Demucs stems, local
Any track becomes `vocals.wav`, `drums.wav`, `bass.wav`, `other.wav` (44.1 kHz stereo) with Meta's
`htdemucs`. Nothing is uploaded; the model downloads once.
## The command
```bash
uv tool install demucs --with numpy # once; --with numpy avoids torch's "Failed to initialize NumPy"
demucs -d mps -o out "song.mp3" # Apple Silicon GPU
demucs -o out "song.mp3" # CUDA if present, else CPU
```
No install: `uvx --with numpy --from demucs demucs -d mps -o out "song.mp3"` (`--from demucs`
because `uvx demucs` alone resolves the wrong entry point).
Output: `out/htdemucs/<file name without extension>/{vocals,drums,bass,other}.wav`.
Measured on an M-series Mac, 60 s of a song, 4 stems including model load: **8.3 s with `-d mps`,
15.7 s on CPU**, stems equal to 0.1 dB between the two. Without `-d`, Demucs does not pick the
Apple GPU on its own.
## Variants
```bash
demucs -d mps --two-stems=vocals -o out "song.mp3" # vocals + no_vocals, ~2x faster: acapella or instrumental
demucs -d mps -n htdemucs_ft -o out "song.mp3" # fine-tuned model, better, ~4x slower
…Read the whole file at its exact version.
How to install
mdr add fortunto2/solo-factory/solo-stem-split@sha256:51ed521b87187c07The line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_3tc53mco2a3gszhx)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 25, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3212 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
fortunto2/solo-factory · 18 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3tc53mco2a3gszhx GET https://markdownregistry.com/api/v1/resolve?ref=fortunto2/solo-factory/solo-stem-split GET https://markdownregistry.com/api/v1/blob/51ed521b87187c07bd427c81ed8c1ddd8f6849a93b7d10a7978f075f3a4056a7
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.