<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1170" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff><FONT face="Courier New" size=2> <DIV>So what about impedance matching of the key and hand/arm? Or the = center of percussion of a key with leads, vs. without?</DIV> <DIV> </DIV> <DIV>There must be some touch issues there also, especially with respect = to fast and hard playing.  Wouldn't center of percussion move closer to = balance rail if springs replaced</DIV> <DIV>leads?  How would that affect touch?</DIV> <DIV> </DIV> <DIV>Thoughts?</DIV> <DIV> </DIV> <DIV>-Mark</DIV></FONT></BODY></HTML>