Buzz in an S&S D

[Andrew and Rebeca Anderson]

Will have to try all those things.  It didn't have this only a month 
ago.  So, I'm suspecting it involves a change in the interim...

Andrew Anderson

At 11:03 PM 3/2/2008, you wrote:

>>With a 10% change in humidity and the upper cover off, the pitch 
>>were the nasty resonance occurred drifted north a semi tone.  After 
>>discussing it with the theater manager I learned that someone had 
>>been brought by the dealership to repair the finish on the 
>>piano.  There was steel wool all over the soundboard and we 
>>suspected FOs out of sight under the plate.  I swung a flexible 
>>steel ruler around a bit but couldn't scare anything out.  The ribs 
>>in the neighborhood looked tight and there were no glue flakes apparent.
>>We decided we could live with it until the piano could be cleaned 
>>out and we can eliminate that possibility.  I did check strings and 
>>various duplex segments all over to no avail.   Pressing on the 
>>soundboard at one point does help alleviate it.
>>Andrew Anderson
>
> From killer Bs to Cs with an MC change? More evidence it's a 
> resonance thing - a(n) harmonic boojum. Does pushing down on the 
> soundboard in the specific place involve pulling up on the plate 
> with fingers to lever down on the soundboard with the thumb? Does 
> pushing down on the board alone make it go away, or pulling up on 
> the plate at that spot without touching the soundboard? Nose bolt 
> cap, bell bolt? How's soundboard clearance around both the nearest 
> nose bolt and bell bolt? Does pushing up on the soundboard from 
> underneath help like pushing down from above? How about pushing 
> down on the plate? All clues.
>
>Ron N