Michael Stehney wrote in 010411 MMD:

> I have tried to find the location of this buzz when the note
> is played, but cannot find it.

This is a common and frustrating problem.  As a professional piano
tech I have found a variety of causes as have my colleagues. The
source often turns out to be the last thing you expected.  Here are
a few common ones to look for:

1.  Loose lid hinge screws.  Check them all.

2.  Lid lock (if it has one).  The little spring inside is a common
culprit and almost impossible to detect.

3.  Any case hardware, i.e., lid prop hinge, etc.  Tighten everything.

4.  Loose sound board buttons.  Tighten them all.  Sometimes one may
be split and the remaining bits will rattle.

5.  Any foreign object that may have fallen under the plate.  Once
I got a call from a lady who's kids spilled beads into the piano.
The entire sound board sounded like a snare drum!  You might want to
blow the piano out with compressed air.

6.  Tighten all plate screws including the nose bolt nuts.

7.  Since it is a player you will absolutely want to check the
tightness of everything under the piano.

8.  One really bizarre scenario: A buzz once turned out to be one of
the cast iron leg flanges which was loose.

Sometimes buzzes can be caused by something completely unrelated to
the piano.  A lamp shade, a framed picture, knickknacks of any kind.
I have been fooled many times, (and amazed my clients), by discovering
that the noise wasn't in the piano at all.  In one case it was a mirror
in the next room which was vibrating against the wall and surrounding
the entire piano!

Good luck.

Rob Goodale, RPT
Las Vegas, NV