Hi all, I'm wishing Johann Sebastian Bach a very happy 323rd birthday.  What wonderful music he left for us!! I have a question of tone and sustain:  I'm just starting the final steps on the circle of refinement on this Steinway A I've told you about...  After working the hammers, tapping strings, string leveling, and several tunings, I have been noticing a continued dead sound and false beating in several mid and high treble strings.I checked the new bridges/pins and they were all solid and well notched.  I was very careful in stringing without twisting or bending wire and used Roslau strings.  For the first time, I used a string roller on a couple of offending notes, re leveled, retuned etc. and voila, the tone and decay increased wonderfully. Question:  Why did this roller work so much better than properly seating and leveling strings? I hadn't had this problem before, so I never used a roller. I even tried the little brass-dowel jig I have for the occasional false beat that usually works, but didn't help much this time.  I guess I don't understand the physics.. Thanks for schooling me! Paul