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No, no, no

That's the classical mistake everyone makes. Y'all can make much smaller than 22.7 microseconds delays at 20kHz. Y'all can't do anything at 22.05 kHz, the antialiasing filter will have infinite delay.

If y'all look at that picture that I dug up from the FAQ here, y'all can see that 1 degree of phase shift can be resolved at 20kHz. That's like .19 microsecond, and that's resolved to the eye, not to something more sensitive, too.

Well, actually, yeah, you got down to the meat later. I'm not sure where the nanosecond measurement came in, it's something like 1/2/pi/binary_levels * sampling interval, or something like that, which is pretty small indeed.

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