G'day Geoffrey, Sorry I'm alittle slow getting back on this, and I may be prepeating what someone else has said...but I get the CAUT list as a digest... As far as I'm aware, this phenomenon is common where the piano has had a temperature shock of some sort. While the pitch patterns over the whole piano indicate the typical humidity fluctuation, the unison variations are absolutely typical of thermal shock. It could be a result of a teacher or student using a fan heater in the room or any other one of a thousand possibilities... is it under an air-con duct? look into the use patterns of the room and if possible monitor the habits of those in the room on a regular basis...if you manage that, I'm sure the whole list would like to know how you did it! Mark Bolsius Bolsius Piano Services Canberra Australia ---------- >From: owner-caut-digest@ptg.org (caut-digest) >To: caut-digest@ptg.org >Subject: caut-digest V1997 #172 >Date: Fri, 29 Oct 1999 1:01 AM > > But the tenor unisons were atrocious. When I checked the pitch of strings > individually, the shortest string, ie. attached to the tuning pin nearest > the capo, was generally a little flat; the string on the middle pin was > either at pitch or a little flat; and the string on the pin closest to the > keys was very flat. A really large difference in the way the strings or > pins behave between the front and back of a unison. Same pattern throughout > the tenor section and to a much lesser extent in the middle section.
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