Inharmonicity factors

[Jason Kanter]

I would just delete the C3 reading - seems like it might be a faulty
reading - would re-measure on a different C3 string and also sample B2 and
C#3 to see more precisely whassup.

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
Behalf Of Cy Shuster
Sent: Wednesday, May 04, 2005 6:01 AM
To: Pianotech
Subject: Re: Inharmonicity factors


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