<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2900.2604" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Julia: you are very likely seeing the = effects of humidity on the overall pitch of a piano. This problem is what humidity = control systems are recommended for.</FONT></DIV> <DIV><FONT face=Arial size=2>Patrick C. Poulson<BR>Registered Piano Technician<BR>Piano Technicians Guild</FONT></DIV></BODY></HTML>