<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; = charset=us-ascii"> <TITLE>Message</TITLE> <META content="MSHTML 6.00.2900.2668" name=GENERATOR></HEAD> <BODY> <DIV><FONT face=Arial size=2><SPAN = class=093124419-13072005>Greetings all --</SPAN></FONT></DIV> <DIV><FONT face=Arial size=2><SPAN class=093124419-13072005></SPAN></FONT> </DIV> <DIV><FONT><SPAN class=093124419-13072005><FONT face=Arial = size=2>Here is the response I got from </FONT><FONT size=2><FONT face=Arial>David = Durbe<SPAN class=093124419-13072005>n at </SPAN></FONT><FONT face=Arial>Yamaha. = I plan on doing a couple of the suggested tests so that I can learn from them, but = my guess is that since this is occurring on a number = of pianos the double-strike that I am experiencing should be considered acceptable = behavior. When you think about it, it really is occurring during a slow movement = that is "outside of normal playing conditions." </FONT></FONT></SPAN></FONT></DIV> <DIV><FONT face=Arial size=2><SPAN class=093124419-13072005></SPAN></FONT> </DIV> <DIV><FONT face=Arial size=2><SPAN class=093124419-13072005>-- Geoff</SPAN></FONT></DIV> <DIV><FONT face=Arial size=2><SPAN class=093124419-13072005></SPAN></FONT> </DIV> <DIV><FONT face=Arial size=2><SPAN class=093124419-13072005><FONT = size=2> <P><FONT color=#0000ff>In this case, the first thing I would mention = is that we need the piano to play correctly under normal playing conditions. As you = know, when we piano technicians are working with a piano, we often will cycle = the action slowly enough to have "malfunctions" occur, which would never = occur under normal playing conditions. We need to be sure that this is happening = under normal playing conditions, and if so, I have some = suggestions.</FONT></P> <P><FONT color=#0000ff>First of all, I would want to be sure that the = keys are traveling the full 10mm distance (with about 250 grams pressure). Then = of course, check that letoff is 2mm in the treble, graduating to 3mm in the = bass (this looks very deep, when compared to the 1/16 or 1/8 inch measurement = that many of us have become accustomed to). If these factors are correct, I = would next test the offending keys with the damp pedal engaged. If the problem = disappears, we know that the damper return springs are a little too = stiff, and we will want to carefully ease those off. If that still does not = eliminate the problem (or if pressing the pedal made no difference), we need to check = the hammer return springs, to be sure that they are set strong enough to do = their job. Again, be careful, use samples, and make any adjustments as evenly = as possible.</FONT></P></FONT></SPAN></FONT></DIV></BODY></HTML>