longitudinal mode?

[Ron Nossaman]

> Tuned a D this afternoon to prep for this afternoon's concert.  A#6 had 
> a short buzz a harmonic above the note.  I could not find an offending 
> duplex (front/back) to mute.  Would this be a longitudinal mode?  Got 
> any ideas to chase this one down?
> 
> Andrew Anderson

Hi Andrew,
I'd think not. The longitudinal would be way up there in 
pitch, and I'm not sure they're even audible that high in the 
scale. Did you isolate unison strings to see if only one made 
the noise? I'd try repositioning the strings a tad, and 
lifting and leveling that unison.
Ron N