<HTML><HEAD> <META charset=US-ASCII http-equiv=Content-Type content="text/html; cha= rset=US-ASCII"> <META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #fffff= f"> <DIV> <DIV>In a message dated 4/10/2004 2:00:24 PM Central Standard Time, pianotun= a@accesscomm.ca writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue = 2px solid"><FONT face=Arial>Hi Wim,<BR><BR>Possibly you are pounding too h= ard. Very small changes in humidity cause<BR>pitch instability in unisons. I= 've documented that on the ptg list. I wish<BR>I had better tools to analyse= what is going on. Temperature (stage lights)<BR>as I'm sure you know can ma= ke huge differences very very rapidly.</FONT></BLOCKQUOTE></DIV> <DIV>I know stage lights can make a difference, but those differences are by= way of the soundboard. If the humidity causes pitch instability, why j= ust one one string? Why not in all of them? Why do some strings go up, and o= ther go down?</DIV> <DIV> </DIV> <DIV>Wim </DIV></BODY></HTML>