Key Excursion

[Jon Page]

Has there ever been established an arc in which the key optimally rotates?

At what point in the keystroke should the surface of the key be, say, parallel
to the floor/keybed.

Should the key fully dip at level or should it traverse level at 
letoff or at damper lift.

Does key length factor in, either vertical or grand. Is there an association
between touchweight measurements and dynamic playing.

Just curious as to opinions. I have mine of course.
-- 

Regards,

Jon Page