Hi Ed, If you have two frequencies one at 150 hertz and another at 50 hertz a "resultant" tone of 100 hertz will be perceived. This is often used in pipe organs to simulate a 32 or 64 foot stop. See here for an explanation of the this effect: http://www.holistic-resonance.com/ToneTheory.html At 05:18 PM 5/15/2003 EDT, you wrote: >Greetings, > Here is a new one on me, it comes from the piano-L list: > >>>Jonathan Gonder performed the Bach-Busoni Chaconne in d >minor. In one of the passages, near the end of the piece, the very lowest >notes of the piano were heard fortissimo in a descending line which went >beyond the lowest A of the piano to a G. > >Jon said how this tone was produced, I can't remember what he said >other than that he struck two notes, a fourth apart, and that in doing so, >the low G was produced. He said that organists do this to compensate when >they do not have pipes which go low enough. > >Can anyone explain this to me? << > > >Ideas, anyone? > >Ed Foote RPT >www.uk-piano.org/edfoote/ >www.uk-piano.org/edfoote/well_tempered_piano.html > <A HREF="http://artists.mp3s.com/artists/399/six_degrees_of_tonality.html"> >MP3.com: Six Degrees of Tonality</A> >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives > > Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. mailto:pianotuna@accesscomm.ca http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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