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Another thread on tap tuning is already discussing vibrational modes. We talk a lot about the first few modes, but, of course, they go on forever, just like harmonics on a string. For anyone who hasn't seen it, here's a nice illustration of the first twenty or so modes of a steel plate:http://www.youtube.com/watch?v=AS67HA4YMCs&feature=related

Wow! I have never seen the majority of those modes. Very interesting. Thanks for posting, Eric.

Yeah, I think we concentate on the lower modes as it's difficult to control the higher frequency modes. Also, the monopole mode is a significant sound producers so it carries a lot of weight toward making a steel string guitar sound balanced.

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Formerly known as Adaboy.......