>Ron, >Me thinks that the ETD only listens to one partial while the ear can listen >to the whole sound and the tuner then finds the sweet spot where the two >sound as one then the three as one. Hi Joe, Yup, that's what I'm thinking. >As for the coupling, could it be that the ETD hears the wide part of the >string vibration whilest when the two strings sound together it hears and we >hear the low? Sort of like the crest and then the bottom of a wave? >Joe Goss That, I don't know for sure. I know the coupled oscillator effect tends to draw slightly different frequencies together, like those clocks on the wall ticking in unison. From a standpoint of driving something at, or near, it's resonant frequency, it's fairly easy at a frequency below resonant frequency, but it's a bit more difficult to drive something at a frequency above it's fundamental resonant frequency . Seems that trying to move something faster than it will move is not the best approach. It resists. >From that standpoint, it would seem pretty obvious that the coupled oscillator would tend to "round down" to the slightly lower of the two or three frequencies, and the overall unison pitch would drop. Maybe all the aural tuner is doing when "minimizing garbage" is raising the lowest common denominator into the range of the rest of the unison, thereby putting the "meet in the middle" point at unison pitch. Hence - no pitch drop. It's not as mysterious and sexy as some of the possibilities I've heard, and proposed, but the idea's starting to grow on me, probably because it's simple and obvious. Ron N
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