---
license: other
license_name: mit-and-cc-by-3.0
license_link: LICENSE.md
library_name: onnx
tags:
  - audio
  - music-transcription
  - piano
  - midi
  - onnx
  - onnxruntime-web
---

# Piano Visualizer assets

Static files used by the [Piano Visualizer](https://rave-tools.com/tools/piano-visualizer) on rave-tools.com: a free tool that turns a piano recording or a MIDI file into a falling-notes video, entirely in the browser. Nothing here runs on a server; the browser downloads these files and does all the work on the device.

## `transkun/`: piano transcription model

[Transkun V2](https://github.com/Yujia-Yan/Transkun) by Yujia Yan (MIT License), exported to ONNX in two graphs so it runs in ONNX Runtime Web:

| File | What it does |
|---|---|
| `transkun_score.onnx` | audio segment → interval scores (which notes sound, from when to when) |
| `transkun_attr.onnx` | detected intervals → velocity, refined onset and offset |

The weights are the published Transkun V2 checkpoint, unchanged; only the graph format differs. Decoding (the semi-CRF search) runs in JavaScript.

## `salamander/`: piano samples

[Salamander Grand Piano V3](https://freepats.zenvoid.org/Piano/acoustic-grand-piano.html) by **Alexander Holm**, licensed under [CC BY 3.0](https://creativecommons.org/licenses/by/3.0/). A Yamaha C5 sampled every minor third from A0 to C8 in 16 velocity layers, plus the string resonance played on key release.

**Changes from the original:** each sample is trimmed after its audible decay (-55 dB below its peak, with a 0.25 s fade) and re-encoded twice, as Opus in Ogg (`ogg/`) and as AAC in M4A (`m4a/`, for Safari). `#` in note names is written `s` (`Ds1v8` = D#1, velocity layer 8).

## License

See [LICENSE.md](LICENSE.md): MIT for the Transkun model, CC BY 3.0 for the Salamander samples.