Hi everyone: This term comes from Italian. It is a precursor to the Astronaut age. Literally it means the head from above. The tone of the high treble is beafier where there is more mass connected to the V-Bar surface which in this case is an inverted V-Bar (V-bar from above) hence the d'Astro portion of the term. Many years ago we did some tests which showed there is better reflection of string energy back to the bridge and soundboard when there is more mass at the front string termination. This test was done on a vertical piano. Some of you may remember that great piano, the Heintzman. Jim Coleman, Sr.
This PTG archive page provided courtesy of Moy Piano Service, LLC