In a message dated 98-01-29 12:55:29 EST, you write:
<< This is very interesting!
> It has been well demonstrated that a
>properly tuned unison will read about 1/2 cent flat of a single string.
This
>presents a problem both in aural and electronic tuning.
Who has demonstrated this and how? There has been some discussion of this
before on the list. But only Jim Coleman has *posted* his results. I had
hoped that another technician would try to duplicate his results!
Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.
"Tuner for the Centre of the Arts" >>
I have seen it at Regional Seminars. Virgil Smith talks about it a lot.
You can do this yourself if you tune a good solid unison as purely as you can,
then set the SAT to it and stop the lights ("0" it out if you like). Now put
in a mute and read the single string. The lights will inevitably roll sharp,
usually about 1/2 ¢. There may be some out there who claim it is even more
but that is my estimation. I'm also not sure if it is a constant amount or
one that varies. It would be an interesting but time-consuming and difficult
study to do.
It is one of the effects of the "coupled motion of strings". I think of it as
something like the "Doppler effect". It is a very real phenomenon. It is
important to be aware of and to compensate for in truly fine tuning.
Bill Bremmer RPT
Madison, Wisconsin
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