Just a reminder, people. Nyquist said that the minimum sample rate for reproducing a singnal is 2x the frequency of that signal. Not that you'd be able to reproduce the correct shape of the signal at that sample rate. A 22 kHz tone sampled at 44.1 kHz basically turns into a triangle wave. There are benefits of sampling higher than 44.1 kHz, even if human ears can't hear all of the frequencies that become possible at higher sampling rates.

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Matthew J. Hill
matt@idsi.net