Those tuning with SAT's may not easily observe this phenomenon, but I use TuneLab on a PC and the effect is quite apparent. If I tune the first string of a unison to the TuneLab phase display, causing the display to be stopped, then tune the remaining stings in the unison and observe the phase display, it indicates a pitch about 1/2 cent flat (maybe somewhat less) for the whole unison. This result caused me quite a bit of consternation at first, but after lots of checking by ear and VTD, I found it to be a common artifact present in any good tuning. Frank Weston ---------- > From: Don <drose@dlcwest.com> > To: pianotech@ptg.org > Subject: Re:1/2 cent difference on unison > Date: Thursday, January 29, 1998 4:26 AM > > Hi Bill, > > 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" > drose@dlcwest.com > 3004 Grant Rd. > REGINA, SK > S4S 5G7 > 306-352-3620 or 1-888-29t-uner
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