New duplex scale promises improvement in upper range sound and utility.

Patented "Fully Tempered Duplex Scale" published by World Intellectual Property Organization.

 "Disclosed below are representative embodiments of methods, systems, and apparatus for improving pianos and like musical instruments. For example, in certain embodiments, the improvements are in the structures of the piano (or like musical instruments) that affect the vibratory relationships between the struck string and other segments of said string..."

Read more of this amazing system from American Inventor Edward J. McMorrow:   Patented Fully Tempered Duplex Scale