[pianotech] justify pitch raise

[Ron Nossaman]

Norm Barrett wrote:
> I asked Dr Sanderson how far off a piano needed to be to need a pitch 
> raise and he said 8 cents. Also when new I was taught that this was 
> caused by the strings pressing down on the soundboard. 

We all were, but it doesn't realistically compute.


>This theory does 
> not make sense for the pianos that have no downbearing. I believe that 
> the plate flexing is the largest factor and the combination of these 2 
> factors means that each piano is a little different and some are easier 
> that others.
> Norm Barrett

Plate flexing makes far more sense to me, but the 8 cents, 
while technically realistic, is functionally impractical in 
real world situations.

Ron N