On 10 Sep 2009, at 12:14, Torsten Anders wrote:
I can actually play HE notation on a Tonal Plexus (http://www.h-pi.com/TPX28intro.html ), slowly, but I never practise :)
This, if one sticks to the key coloring, is in fact just five translated keyboard of the layout I indicated. So if imposing full transposition-by-translation, it just divides the M - m interval into five parts. For CPP music harmony, it might be better to use a quarter- comma meantone, or the closely related E31, which on the keyboard the becomes E155 = E(5*31). The Pythagorean tuning and its approximations E12l E41 (which is what is descried on he page above) and E53.
But one can move one step further, if transposition is only needed in M & m amounts. The center keys might be set in Pythagorean tuning, and the offsets a double syntonic comma for use with Persian music, or single syntonic comma for Turkish music. Or second offset might be used to hit the partial 7/4 exactly.
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