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Even 256kHz 48-bit can't even get close to what I need when it comes to pitch-shifting an audio sample up even one single octave. It produces audible 'warbling' like a poorly-encoded MP3, or a badly-fatigued guitar string.

We aren't close to peak audio, yet.

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Assuming you're talking about pitch shifting without changing speed, that warbling doesn't have anything to do with the quality of the source sample. It's just how the pitch shifting algorithm works.

Nah, this happens even in my hardware guitar pitch-shifting pedal. That one is pure analog. Guitar doesn't warble, but throw FLAC through it and you will get the warbling.

Exactly an octave is easy... just discard every other sample and smash the remaining ones together.

Except it's not... You need to filter down to below the new Nyquist frequency first or you will add tons of aliasing.

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