PAULREVENKOJONES at aol.com wrote: > > > In a message dated 11/13/2009 9:05:24 P.M. Central Standard Time, > nature.dude at yahoo.com writes: > > I've seen several piano tuning software with pre-determined > stretches (ex. Grand Piano 6 to 7 ft, Vertical Piano 39 to 51 > inches, etc). It seems as if the middle 4 octaves or so are > tuned with pure octaves while the higher and lower octaves include > the stretch. I've never tuned using pre-defined tunings. Has > anyone here? I wonder what kind of results people get using > software with pre-determined stretches. Anyone wish to comment? > > I shouldn't but... > > There is still vast confusion in the use of the phrases "pure octave" > and stretch. All properly tuned octaves are slightly wider at some > coincident partial, so stretched. You choose the coincident partial > set of your liking. > > I am not familiar enough with machines to speak to how they treat > octaves in the midrange, but it is evident and calculable that as you > go deeper into the bass and higher into the treble, the octaves > stretch more. There is no such thing as a "pure" octave; there will > always be some coincident partial set beating. > > P Yes, you shouldn't have - you are going way out of the context of what I was trying to say - you are back into partials, beats, etc. To me, a pure octave is when you play C4 and C5 together, and hear no beats or wave-y-ness. Just like tuning unisons of a tri-string and they are in tune when you hear no beats or waves, except they are an octave apart. If C4 is in tune and you hear beats, that means C5 is sharp or flat. -- Duaine Hechler Piano, Player Piano, Pump Organ Tuning, Servicing & Rebuilding Reed Organ Society Member Florissant, MO 63034 (314) 838-5587 dahechler at att.net www.hechlerpianoandorgan.com -- Home & Business user of Linux - 10 years
This PTG archive page provided courtesy of Moy Piano Service, LLC