Noise Shaping about qoa HOT 3 OPEN

This should only affect the quantization noise that is added by the encoder; it won't remove any noise that is present in the source. But yes, making it optional is certainly the right idea!

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audio-formats has TDPF (courtesy of MIT-licensed Airwindows, tuned and modified by me to fit WAV) dithering in its QOA encoder now: https://github.com/AuburnSounds/audio-formats/blob/master/source/audioformats/qoa.d#L724
It was tuned for WAV. imo It's more important to get dithering levels right rather than get the best dithering. I will finetune the dither level for QOA encoding. (EDIT: errr, disabled for now, it sounds worse than without dithering)

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Maybe something that could be optional or configurable? Some of the audio files I’m thinking of using QOA for have a lot of noise to begin with that I would like to keep more or less intact, almost treating it like data rather than audible signal. But perhaps I misunderstand what this shaping does.

I can’t hear the difference in your example page with my cheapo headphones but in Audacity comparing files with Invert it becomes more noticeable. Will need to do some more tests.

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