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Klarinet Archive - Posting 000186.txt from 2001/02

From: David Glenn <>
Subj: Re: [kl] Re: strange intonation in warm up exercise
Date: Tue, 6 Feb 2001 17:02:33 -0500 wrote:

> I'm going to take a stab at an answer on this with the caveat that everyone
> knows I am not an acoustician. A "stab" is as scientific as this gets.
> First off, these are my exercises and I am glad that they are useful to
> someone. You can find the printout version and accompaniing article at
> The question here is what is the tuner measuring. Even though there are only
> two people performing, there are many posibilities and it is difficult to
> know exactly which. You can get an extra clue if your tuner indicates which
> octave as well as which note it is reading. Check this carefully, it could
> be reading an upper harmonic of one of your tones. I find that the
> accoustics of the particular room has a great deal to do with how the sounds
> blend in the space. For example, when two people sound a major second
> interval you hear a third tone called a difference tone. If one of the
> players changes position, each would be able to hear varying volumes of that
> difference tone.
> Speaking of difference tone, It is quite possible that what the tuner is
> measuring is that difference tone. Again, check the octave indicator on the
> tuner if it has one.
> It is a curious question. Let us know what you find out.
> Tom Labadorf


Great! Thanks Tom, the check's in the mail!

Unfortunately, my tuner is very simple and doesn't show the octave. I'll have to
see if I can get ahold of such a machine.

What is the difference tone when two persons are playing an octave?


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