temperament information

Ron Koval drwoodwind@hotmail.com
Thu, 13 Feb 2003 15:51:26 +0000


For those of you interested, it can be helpful to look at a graphical 
representation of the temperaments, when choosing which one to set on an 
instrument.  Jason Kanter has done a great service to our community by 
transferring the published offsets of both historical temperaments and 
modern creations of alternate temperaments.  These can be found at:

www.rollingball.com

In these graphs you can find the width of the major thirds, minor thirds and 
5ths, arranged in circle of fifths order.  Also documented is predicted beat 
rates, as well as the EDT offsets.

When tuning, I like to look at three numbers:

1. the maximum offset from ET
2. the width of the smallest third
3. the width of the largest third

Once you have those numbers, the shape of the graph gives you an idea of how 
many thirds are purer than ET and how many are less pure than ET.  Remember 
that modern ears will start noticing that something is amiss once the major 
thirds cross the 17-18 cent width.  With that in mind, all of the "biggies" 
(Vallotti, Young, etc.) with their 21+ cent thirds will be a big change from 
ET.

The Maximum offset number may help explain why the Vallotti might have been 
a problem for the string players.  Even though the Vallotti and the Young 
graphs appear similar, the maximum offset for the Young is around 6 cents, 
while the Vallotti pushes up somewhere around 8 cents from ET.

I'd really recommend starting with the milder modern creations that have 
been formulated with an eye to beat-rate progressions and checking the Minor 
3rd/Major 3rd ratios.

Ron Koval
Concordia University





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