On Aug 25, 2010, at 7:47 PM, Paul Milesi, RPT wrote: > when you say that "what was accelerated was the ratio, in theory," do > you mean to say that the ratio was increased? In other words, it > might go > from 1:4.9 up to 1:5 as the key is depressed? Actually this occurs with any piano key. It doesn't pivot on a sharp fulcrum, it squishes on some felt. The pivot point moves toward the front of the key. If you take standard punchings and trim the side toward the front of the key, you'll find the ratio (measured most easily by DW) goes down, which is another way of saying that having the felt there in front must have been increasing the ratio as the key was depressed. The key rides up and down the keypin a bit every time it is played. It's another one of those things where the closer you look the less precise it becomes - we are told to measure key ratio to the middle of the balance hole, but it ain't so, nor is the termination of a piano string the tangent or middle of a bridge pin. Regards, Fred Sturm fssturm at unm.edu http://www.youtube.com/fredsturm
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