<div>I got it!</div> <div> </div> <div>Maybe your unison on C3 is out.  Way out. Out like one of the bichord strings on C3 is a half step flat.  Then the two strings of B2 would vibrate in sympathy with the mistuned C3 string.  But...only when the sustain pedal engaged! </div> <div> </div> <div>Tom Sivak</div> <div>Chicago<BR><BR><B><I>PIANOTECHNICIAN@aol.com</I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content="MSHTML 6.00.6000.16414" name=GENERATOR><FONT id=role_document face=Arial color=#000000 size=2> <DIV>I have a customer with a Petrov upright, about 7 years old. The problem is in the bass section. When you play C3 loudly with the sustaining pedal down, you hear a bit of the B next to it. The problem is NOT caused by the hammer being misaligned and striking part of the B bass string - -the hammer is nowhere near the B string. In fact, BOTH strings of the B note are vibrating when the C note is played loudly. I've never seen this problem or heard of it in all my years in business. Any ideas?</DIV> <DIV> </DIV> <DIV>Jesse Gitnik</DIV> <DIV>Since 1980</DIV></FONT><BR><BR><BR> <DIV><FONT style="FONT: 10pt ARIAL, SAN-SERIF; COLOR: black"> <HR style="MARGIN-TOP: 10px"> AOL now offers free email to everyone. Find out more about what's free from AOL at <A title=http://www.aol.com?ncid=AOLAOF00020000000339 href="http://www.aol.com/?ncid=AOLAOF00020000000339" target=_blank><B>AOL.com</B></A>. </FONT></DIV></BLOCKQUOTE><BR>