I have read that, in Duo-Art pianos with the longer keys, the hammer
striking distance is 1-7/8" rather than the normal 1-3/4".  This is
a guideline I have always followed, and I have never had any of the
finest musicians who played them say anything about my two Webers other
than accolades on how finely regulated they are.

I must also note that most factories specify that the longest concert
grand models (over 7 feet) in their grand piano lines should have a
strike distance of 1-7/8" because of the longer keys.  Some old guys
used to say it was to be able to play louder but I have my doubts on
that count.

I have never had any problem with regulating or playing a Duo-Art
or a concert grand some of which have longer keys than any reproducer.
I suspect that the old myth that longer keys somehow make Duo Art
"defective" are pure poppycock and first put forth by some piano
salesman who sold brands other than Duo-Art.

D.L. Bullock   St. Louis
www.thepianoworld.com