<HTML> <HEAD> <TITLE>Re: Octave Tuning</TITLE> </HEAD> <BODY> <BLOCKQUOTE><BLOCKQUOTE><BLOCKQUOTE><BLOCKQUOTE>There is also some suggestion that a truely "pure" unison gives the pia= no a rather "dead" sound with poor sustain. </BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE> I believe I have proven, at least to myself, beyond a shadow of a doubt tha= t exactly the opposite is true:  When the unison is “stood stock = still,” the sustain and resonance of that note is increased to the max= imum that is possible, given all the other mitigating factors. Another way t= hat concert-level tuners get “all there is” out of a piano when = tuning---and a big part of the psychoacoustic illusion that is created by a = good tuning (i.e., “you voiced it!” or “the action feels s= o much better” when all you’ve done is tune.) Hope this helps--- David Andersen </BODY> </HTML>