<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html>   Isaac OLEG wrote:    Hello Tom, Indeed your comment make sense, the lightening is to be supported by the pianist's hand but indeed the whippen ratio is probably changing, as the friction between the capstan and whippen heel).  These virtual changes are probably not the same depending the speed the key is played, but I just suspect it, don't see why it should be.  If there is a reaction time between the magnets then they act as springs are not they ? Is there one ??????? The magnetic field can of course be compressed, but in this case the degree of compression is restricted by the back capstan until the key through most of its stroke.  I would suspect there might be some effect from this on hard play, but I would also suspect that would not be enough to worry about. Still, it needs to be checked out and I am in the process of doing just that. Good point Isaac :) I wish I will be experimenting with those before the end of the month .  I showed the setup to Stephen Paulello, and he find the idea very neat, he experimented once with a magnet driven letoff, that suppress the friction at the button, but indeed too much problems to be precise and consistent. Very interesting project, and a generous Richard ! Greetings.Isaac OLEG -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway <A HREF="mailto:rbrekne@broadpark.no">mailto:rbrekne@broadpark.no</A> <A HREF="http://home.broadpark.no/~rbrekne/ricmain.html">http://home.broadpark.no/~rbrekne/ricmain.html</A> <A HREF="http://www.hf.uib.no/grieg/personer/cv_RB.html">http://www.hf.uib.no/grieg/personer/cv_RB.html</A>  </html>