Not to be disagreeable but I don't think those are functional reasons. The difference in the amount of key over the front pin is not significant with only a 2 mm rise in the middle. Also, assuming the aftertouch is set uniformly to begin with then whether the keys are level or curved the aftertouch will diminish as the keys settle in the middle. David Love www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of A440A at aol.com Sent: Tuesday, June 23, 2009 6:02 PM To: pianotech at ptg.org Subject: Re: [pianotech] Leveling keys Joe writes: << Steinways key cover is straight, as well. Why do they advocate a curved keyboard??? I have asked and NO ONE has ever told me: #1 when that policy started. #2 why that policy started. #3 what advantage, if any, this would do. When they come up with a rationale, (yeah, like that's going to happen!), reason...I'll keep setting them keys FLAT/LEVEL/Parallel! >> Greetings, One reason is that if the keybed and keyframe are curved, you have to level the keys in a similar fashion if you want them to all be sitting over the same amount of front pin. Another is that worn keyboards all seem to have a reverse curve to the key level, so beginning them with a slight curve upwards will maintain usuable amounts of aftertouch longer than if they were flat. There, that is two functional reasons. regards, Ed Foote RPT http://www.uk-piano.org/edfoote/index.html www.uk-piano.org/edfoote/well_tempered_piano.html <BR><BR><BR>**************<BR>An Excellent Credit Score is 750. See Yours in Just 2 Easy Steps! (http://pr.atwola.com/promoclk/100126575x1222377052x1201454391/aol?redir=htt p://www.freecreditreport.com/pm/default.aspx?sc=668072& hmpgID=62&bcd=JuneExcfooterNO62)</HTML>
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