FAC database

[Newton Hunt]

If the numbers are appreciable different after a pitch raise then you
likely did not measure as accurately the first time.  Changing the
tension of a string as much as 100 cents will not change the
inharmonicity enough to justify remeasuring the FACs.

Humidity will change the A from one season to another because,
according to AL, it is likely that the soundboard impedance has
changed.

Try taking FACs from the same piano, without tuning it, and you will
get slightly different measurements each time doe mostly to SAT
location or picking up a different segment of the wave form.

Now isn't this all fun?

		Newton