Inharmonicity factors

[Cy Shuster]

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OK, that makes sense; smoothness in everything across the keyboard is what 
we want.  With TuneLab, I measure iH across the wound/plain string break to 
determine when to use it's "split-scale" mode.  Robert suggests that more 
than a 20% jump in iH should trigger use of this mode.

To my surprise, I found a big jump there on a 1983 Yamaha U3, which I 
thought should have a pretty good scale (since it's so big).  Anything funny 
with this particular scale?  (See attached screenshot of iH).

--Cy--

----- Original Message ----- 
From: "Ron Nossaman" <rnossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Wednesday, May 04, 2005 8:47 AM
Subject: Re: Inharmonicity factors


> Hi Cy,
> The problem is inharmonicity isn't a particularly critical factor in 
> scaling. Spot sampling won't tell you much about anything but expected 
> octave stretch in tuning. Tension, impedance (loudness), and break% are 
> better initial indicators of how the scale will sound, and break% will 
> tell you something about how it will go out of tune. Seeing all the 
> numbers for all the notes will let you see what happens at the 
> transitions, so you don't build something that can't be tuned or voiced. 
> For the most part, changes at the scale breaks are more important factors 
> than actual number values.
>
> Ron N

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