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? Thanks David Love www.davidlovepianos.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120824/eb29a81c/attachment.htm>
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