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Nice, but if 24_tuba_arpegio_melodious_phrase_stereo on the samples page is not a conversion error, it might explain why at least basic psychoacoustic model and/or post-processing filter are expected. That static beat is noticeable precisely because of its repetition.

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Good catch! That's likely an artifact of the LMS state being quantized[1] at every frame border. I will look for ways to improve this.

[1] https://github.com/phoboslab/qoa/blob/master/qoa.h#L324-L336

Given how large the frames are in QOA, it doesn't seem like too much overhead to have the full history and weights stored per frame (if seeking to any frame is required).

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