[pianotech] Another ETD check

[Ron Nossaman]

On 5/14/2012 2:46 PM, Ron Koval wrote:

>
> Yes Wookie-San, questions abound!  I have read about FAC numbers changing with
>
> the seasons, and there was some chatter on the Verituner list about not trusting
>
> saved tunings....  I tried measuring a tuned and de-tuned piano to see if the Verituner
>
> came up with different inharmonicity data, (it didn't) but haven't ever documented the
>
> seasonal swings.  (sounds like more practice room data gathering is in the works!)

No, not practice room tunings with an ETD. I'd very much like to see 
just what I described, for the reasons I gave - a recorded and saved 
test master tuning data set on the same aurally super tuned piano at 
significantly different humidity levels. I have no doubt this has been 
done, and the data already exists, so it ought to be much easier than I 
expect it will prove to be to obtain.


>  I suppose this matters more to those that live in areas with real 
seasons...

Since I don't tune with an ETD, it's educational in other aspects on my 
part, and has the potential toward supplying the beginnings of answers 
to long unanswered speculation.
Ron N