[EMAIL PROTECTED] wrote:

> If my reference clock is running at ~44100 Hz and through my NTP
> exchanges, I get an instantaneous offset of -20 Hz, 

....you have broken hardware.  Once you correct for systematic error, a 
crystal should be within single figure parts per million, even over a 
wide temperature range, so your maximum frequency error in the sampling 
clock should be about 0.5Hz., or at A=440, about 0.0044Hz.

Note that the maximum correction that ntpd can apply is 500ppm, which 
corresponds to 25Hz at 44.1kHz.  It will only apply that correction if 
there is a sustained and serious synchronisation error.

Incidentally, this is an example of an application where running the 
core clock discipline algorithm at long intervales would be very disruptive.

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