README.md

metadata

license: other
license_name: mix-directive-model-license
license_link: LICENSE.md
library_name: onnx
pipeline_tag: audio-to-audio
tags:
  - music-source-separation
  - stem-separation
  - mix-directive

Mix Directive Stem Splitter (4-stem, v1)

The stem separation model used by the Mix Directive desktop app. It splits a stereo mix into drums, bass, other and vocals.

This model is proprietary. It is published here only so the Mix Directive app can download it on demand. Using it outside the app, redistributing it, or building on it is not permitted: see LICENSE.md.

Files

File	What it is	SHA-256
model_fp16.onnx	the model (ONNX, fp16 weights, 56 MB)	f45b4b79dd08b9e0237bd7420b735659b043edb25b572949dbb4ae5ce3fe110b
model_config.json	sources, sample rate, segment length, input normalisation	af642c9ac4e3812449c847ec5bc969b15fa791faa4a5d14f2d2de3b7968db809

The app pins a specific commit of this repository and checks each file's SHA-256 before using it.

Model

• Architecture: Hybrid Transformer Demucs (the open-source demucs 4.1 architecture, MIT), 22.6M parameters, 44.1 kHz stereo, 6 s segments.
• Weights: trained from random initialisation by Mix Directive. No pretrained third-party weights were used.
• Training data: music owned by the Mix Directive author, used with full rights. The model does not contain or reproduce those recordings.

Intended use

Separating music the user has the right to process, inside the Mix Directive app (stem extraction before mixing and Auto-Mix). Results can contain bleed between stems and artefacts, especially in the "other" stem.

License

Mix Directive Stem Splitter Model License v1.0 — see LICENSE.md. All rights reserved.