> I believe the poster was referring to a 5% error
> _between_ semitones. This is only 5 cents, and
> thus inaudible, I would expect, to all but the very
> best ears.

I agree, anyone with perfect pitch would be able
to hear the difference. Almost all people could not
tell the absolute tuning of one instrument on its own

Get two together with slightly different tuning - ugh

You could produce a 440Hz "A" reference tone from
a 20MHz crystal using 4040s and 4081s. Divide the
20,000,000 by B18E ( b'1011000110001110' ) to
get 440.00Hz. Or you could use a 16-bit timer if it's
not busy. Further divide this by 8 to get 55Hz for the
bass A string

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