At 01:46 PM 1/18/2006, Jud McCranie wrote: >I looked at this sometime ago. The important thing about 12 >equally-spaced tones is that r^4 is close to 5/4, r^5 is close to 4/3, and >r^7 is close to 3/2, r is the 12-th root of 2, as above. And r^3 is close to 6/5.