Bernard said: "A P12 is a octave + fifth and is pure, when the 3rd harmonic of then lower key has the same frequency of the base frequency of the upper key." Bernard, Thanks for the clarification. I now know where I went off....I was counting chromatically! Duh! Now that I know what the heck everyone has been discussing, I'll have to say....that's what I do and didn't have the label of "P12" to hang on it.<G> Best Regards, Joe Garrett, RPT, (Oregon) Captain, Tool Police Squares Are I
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