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README.md

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----
-license: mit
----
+---
+license: mit
+library_name: onnxruntime
+pipeline_tag: audio-to-audio
+tags:
+  - onnx
+  - onnxruntime
+  - audio
+  - music
+  - source-separation
+  - stem-separation
+  - demucs
+  - htdemucs
+  - hybrid-transformer-demucs
+  - vocals
+  - drums
+  - bass
+---
+
+# Silverdaw Backup Stem Pack — htdemucs fine-tuned (ONNX)
+
+An ONNX export of the **Hybrid Transformer Demucs** fine-tuned 4-stem model
+(`htdemucs_ft`), used by [Silverdaw](https://github.com/irarainey/silverdaw) as
+its **backup** stem-separation engine. `htdemucs_ft` is a "bag" of four
+specialist models — one per source — so vocals / drums / bass / other are all
+native outputs.
+
+Silverdaw's primary engine is the higher-quality RoFormer pack pair
+([vocals](https://huggingface.co/silverdaw/mel-band-roformer-vocals-onnx) +
+[rhythm](https://huggingface.co/silverdaw/bs-roformer-rhythm-onnx)); this model
+is used when those packs are not installed, or when the user explicitly selects
+the backup engine.
+
+This repository is a **re-host** of
+[`StemSplitio/htdemucs-ft-onnx`](https://huggingface.co/StemSplitio/htdemucs-ft-onnx)
+so Silverdaw can serve every model it needs from one self-owned location. The
+weights and the export are unchanged (byte-identical; same SHA-256).
+
+## Files
+
+| File | Size | Stem | SHA-256 |
+| --- | --- | --- | --- |
+| `htdemucs_ft_vocals.onnx` | ~302 MB | vocals | `8c5d5e2da1f27050240bb80236673307ee3b40d4b064066d9350f4d64bfd544d` |
+| `htdemucs_ft_drums.onnx` | ~302 MB | drums | `f76b68af36066e38885b369299b5032a861038f9b49da5aa6cf1c31cfa69cf27` |
+| `htdemucs_ft_bass.onnx` | ~302 MB | bass | `2a74d9283fc2336fcc58d50f87a7080aff57aea372f65cfe3f0211ea1ff16182` |
+| `htdemucs_ft_other.onnx` | ~302 MB | other | `90e11806c1bb558ca9d9c7e909d28a2854f7f217982e90482dbed6442513daad` |
+
+Each file is a self-contained `.onnx` (fp32 weights, no external `.data`). fp32
+is chosen over the fp16 variants for the CPU execution provider, where fp16 ops
+are commonly emulated (slower) rather than accelerated.
+
+## Provenance & license
+
+**License: MIT.**
+
+- **Weights** — © Meta / Alexandre Défossez et al., *Demucs v4* (Hybrid
+  Transformer Demucs, fine-tuned), released under MIT.
+- **ONNX export** — © StemSplitio
+  ([`StemSplitio/htdemucs-ft-onnx`](https://huggingface.co/StemSplitio/htdemucs-ft-onnx)).
+- **Architecture / paper** — *Hybrid Transformers for Music Source Separation*
+  (Rouard, Massa, Défossez; arXiv:2211.08553) /
+  [`facebookresearch/demucs`](https://github.com/facebookresearch/demucs) (MIT).
+
+## Intended use
+
+Designed for offline (non-real-time) stem separation inside a desktop DAW. It is
+not a real-time audio-callback model — run it on a worker/background thread.

htdemucs_ft_bass.onnx

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+size 316446953

htdemucs_ft_drums.onnx

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htdemucs_ft_other.onnx

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htdemucs_ft_vocals.onnx

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