Unstable C5 Grand

[Newton Hunt]

> The piano is very bright and needs voicing, but 
> the music director likes this bright sound.

The brighter the sound, the harder they play the less stable the unisons will
be.  You may need to take the piano down a little in that region and see how it
stays.

You might consider lubricating the strings in that area with a little Protek. 
Do this, with a very small artists brush, each time yo tune and see how that
helps.

Check the plate screws and bolts, the fit of the block to the plate in that
area.  If this is all normal try jacking up the block in that area and
tightening the screws again.

The brighter the sound the less hard you tend to hit the keys.  Put in some ear
plugs while you tune this area and you might find it a little more stable.

                Newton