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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091113/cebf9a76/attachment.htm>
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