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In practice it's all about energy balance ... what good are absolute notes? The whole "I hear a B note in the bass, that's equal so and so hertz" is really where it seems silly.
If anything, the keyboard is an interesting image for me, as a way to consider where roots meet numbers. But I'd never use it in a session. And my piano's low B, has a totally different overtone series to your piano, etc. Then a chord comes along ... nevermind a bar or two...
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