humidity effect

[Roger Jolly]

Hi Don,
            Perhaps not explaining myself well. Since you leave the piano
with good unison's.
I presumed it was noted before.  
The suggestion for tuning the strings the in reverse order, would mean that
you would have to wait 6months or a year to observe results.

An institutional piano, with no DC would be a good candidate, if tuned now,
and if you could check it again before Xmas once the humidity really drops.

It would not be too scientific, but may offer some clues.  The difference
in pitch on the unisons of the Young Chang was seemed suprisingly high. If
only one pass was made in the tuning, could it be due to some king of
coupling effect, due to raising the pitch of the next higher note?
Reinforcing the need to have two passes for a more stable tuning. get all
strings within a few cents then fine tune?

You raise a question with a lot of variables. Impedence, bridge coupling,
friction, string tuning order, technique, back scale length, forward duplex
geometry.
Regards roger 

Roger Jolly
Saskatoon, Canada.
306-665-0213
Fax 652-0505