Hello list, Many thanks to Berhard, Ron, Richard, and David-- all great suggestions and diagnostic routines. I'll likely do very careful tests as the piano is a >10 year pristine 7' Seiler and I got in quite deep with this person a few years back (acoustically isolating the action rails.. it worked but neither of us were terribly satisfied with the experience). Also the sound is at the very edge of my perception what with age and all. Great things to try where as before I had none. On the vein: ever since the first reading on longitudinal waves in the PTG journal several years back, I've wondered if there are, occasionally, rather pronounced problems in S&S models M through A in the octave below mC. These unwelcome sounds have been more distinguishable and in the same four 8va above fundamental range. I've always wondered why the owner/players have not complained... I've never pointed it out to same. Comments?
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