This was a theoretical study; I do not think the 15/8, 21/16, and 35/32 to be important harmonic intervals, but I do think the result of setting the errors of the harmonics equal and equal/opposite to be interesting. The methods are the same as in the earlier post on negative systems. The functions are (F-X), (T+8*X-5*OCT), (S+14*X-9*OCT), (E+18*X-11*OCT) and (Th+21*X-13*OCT). The latter two are 11/8 and 13/8. I have not included the 6/5 or 5/3 in these calculations. See my paper in XH2.
Doubly postive systems resembling 22-tet are also possible. I will post some such tunings at a later date.
--John
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