> My question is, what does one look for in this M4 - > i.e. what kind of relationsship? Hello, Jerry, If the beat rate of the sixth and the thrid are the same then the fourth is pure. (Example F3-D4 is 7 pbs, F3-A3 is 7bps then A3-D4 is a pure fourth and needs expanding.) Normally we should expect a beat rate differential of between 1 and 1.5 beats per second. Faster beats are more easily discernable than slow ones so it is possible to control fourth tempering by listening to the sixths and thirds. Newton nhunt@jagat.com "Hunts of the world unite!" :o) :>)
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