audio_example.wav is converted from
https://github.com/deezer/spleeter/blob/v1.4.0/audio_example.mp3
with the following command

sox audio_example.mp3 audio_example.wav

UVR models are converted from
https://github.com/TRvlvr/model_repo/releases/tag/all_public_uvr_models
using the code from
https://github.com/k2-fsa/sherpa-onnx/tree/master/scripts/uvr_mdx