>The result is that the error has been reduced as I'm now
>reading $002 instead of $004 or $008 in the 'unused' channels.

I've never seen a "noise problem" when using the A/D.  Every time I pull the
pin to ground (turn the pot to zero) it reads 0x000.  Not 0x002 or 0x001,
but 0x000.

There must be something else causing it not to drop all the way.  But at
320us, it sounds like you're giving it plenty of time.  Have you tried 500us
just to see?  How about 1ms?

--Andrew

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