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ONNX export of **Beat This!**, the JKU beat/downbeat tracker (checkpoint `final0`), packaged for the [`musetric`][musetric] `packages/ai` runtime on `onnxruntime-web`'s **WebGPU** execution provider. Feature extraction is the host's job, and `mel-filterbank.bin` is what it needs to do it: the host computes the log-mel spectrogram on the GPU (STFT + this filterbank + `log1p`) and feeds windows straight into the graph as GPU buffers, never round-tripping features through the CPU. **Feed one 1500-frame window per call** — the author's window, 30 s of audio. Longer tracks are covered by overlapping windows in the host (`chunkSize` 1500, `borderSize` 6). Batching every window into a single call materializes a huge time-attention tensor; one window per call is why the graph takes a window axis at all. Short clips must be padded to 1500 frames.

Audio processing
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