[pianotech] action ratio

[Joseph Garrett]

David said: "One formula for the action ratio has been given as:
 
 
Key out x wippen out x shank out = blow distance - let off
 
Key in wippen in shank in key dip - after touch
 
 
 
Does anyone happen to know what the standard (or minimum) aftertouch is in
this formula or how it was derived? "

David,
First of all, I need to know what the hell "key out...." and "key in..."
means. Have never heard the terms. I suspect if I knew, I'd get a headache
Joe


Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I