[CAUT] damper chirp

[geinert at drtel.net]

Last night I was at a Bosendorfer Imperial I service.  A couple months ago I 
regulated and voiced it.  Last night, when played with the shift pedal, whenever 
the dampers were lowered they would chirp.   It was not completely unlike what 
a glazed damper sounds like, but these are pretty new, and definitely not 
glazed.

When I had regulated this, too  bright/not enough warmth were the complaints.  
When voicing una corda, even though I know Bosendorfer does not set the shift 
to clear the left string I did it anyway.  I tried to figure out why not to at the time 
and couldn't come up with a reason.  Last night when the dampers were 
chirping, I checked right away to see if the clearing string was the problem, and 
it was.  Setting the action shift back to put the strings between the grooves and 
the chirp went away.

I am interested to hear theories of why that would  be.  No other piano I have set 
with the left string to clear when the action is shifted does this.(that I know of 
anyway)

Tim Geinert