A few other temperament questions

[KeyKat88 at aol.com]

Greetings,

           If I finally pick a tuning and proceed, do I tune to A440? The 
Rollingball website .gif charts illistrate the temperament intervals from C to C. 
Do I start on middle C? If so, middle C of 523Hz (as in an A-440 tuning), or 
would I tune middle C lower?  Can I still tune an F to F procedure as I am 
used to for ET? 

          Also, what does it mean on the side of the Rollingball chart where 
it states the following sentence: "To zero out total tension change, add this 
to each offset"....then it gives a number, for example the Valotti has a  
-1.96 below that sentence. 

         Also, on the Rollingball chart, the low C-G and E-G is different bps 
than octave above it. Must I follow that difference through with all the 
octaves C# to C#, D to D...etc, thereby giving a "stretch" to the whole piano's 
tuning? if that answer is yes then the whole piano is a temperament itself, and 
I am not copying octaves as I would do in ET!!!???? Right? Are these 
temperaments stretched. Woah! I have never done this before.

Julia Gottshall
Reading, PA       
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