[CAUT] Toughest piece for piano stability?

[Susan Kline]

Yeah, Ron, that is a problem at the first capo break, C#5 and D5, 
definitely they tend to have some beats and are harder to settle. And 
your curve is miles better.

But D#6 is the note which is wonky, on several D's I look after. 
Definitely a trouble note, and way up in the middle of the section. The 
tone is just not clear, never mind the tuning stability. It's more like 
the tone in the middle of Octave 7, but it's way down in Octave 6 where 
people are using it all the time. I'd be really interested if anyone has 
figured D#6 out, why it is that way, and what might be done. As far as 
I'm aware, it's a Steinway D problem. I haven't noticed it on other 
Steinway models or other brands. (Though other brands sometimes have 
their own issues.)

Susan Kline

On 11/8/2010 2:46 PM, Ron Nossaman wrote:
> On 11/8/2010 4:08 PM, Fred Sturm wrote:
>>
>> On Nov 8, 2010, at 1:40 PM, Susan Kline wrote:
>>
>>> D#6? Not D#5?
>>
>>
>> Oops! you're right, what I meant was C5, C#5, D5 area.
>
> That's what I thought. Right across the break. Attached is a chart of 
> speaking lengths of the original, six on either side of the break, and 
> a revised version. They don't progress in the original because there 
> is still insufficient dogleg in the bridge across the break to allow a 
> smooth progression to fit. As length progression changes, so does 
> break% progression, and with that, tuning stability. That F-5 in the 
> Yamaha verticals does the same thing for the same reason. That high in 
> the scale, the strike ratio changes abruptly by a millimeter or so 
> across that break too, which will change the timbre a bit as well.
>
> Ron N