Hi John,

There is one very easy way to virtually eliminate nodal ringing
in the low tenor region of upright pianos. Install tri-chord
damper felts. And if you want to take it one step further, cut a
small 'V' in the face of the felt piece which will effectively
create two contact points.

Musically,
John A. Tuttle (johntuttle@playercare.com)
-----------------------------------------  -------------------------------------------------------------
  John Tuttle "Self-Playing Pianos" http://www.PlayerCare.com
   407 19th Avenue        E-Mail: JohnTuttle@PlayerCare.com
    Bricktown, NJ 08724      "We Keep Your Music Rolling"