Dear Larry,  If your project is going to improve the Yamaha and is
going to contribute to your happiness, go ahead; I'm sure that American
Piano Co. and Mr. Fujito Yamaha would approve that.  Don't pay
attention to so many disapproving words -- you are a free man in a,
I hope, democratic free country.  Your piano is not a rare unique piece
of art; don't feel guilty for doing the conversion.  I'm sure that the
final result will be superb.

I'm going to do myself a transformation on my Canadian Williams Co.
piano.  It's a superb upright piano, 5 feet tall, and with a very
responsive wooden player action made by Otto Higel.

I've played all my life and made my musical studies on the finest
upright German brands that you can imagine, and only one piano was
better than this one of mine: a Pfeiffer, so I'm going to add a Duo-Art
system.

So what?  Is it a crime?  No, for myself it's an improvement; this is
all that counts.

My next project (when I have a house for it) will be to add a Duo-Art
system to a concert grand Bechstein, because to my ears and my hands
it's the most appropriate piano.  If the Yamaha grand suits you, just
do it -- it's not going to be easy but I'm sure it's not impossible.

Kind regards to all

Miguel de Mattos
Lisbon, Portugal