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"FWIW, In the early '70s I was visiting a top level R&D lab in
Nashville. A tech was showing me some of their projects. One
was using a measurement mic. I was very small, about the size of a
cigarette filter. He said the freq response was very good but it was
worthless for audio recording. "

So this begs the question: When and where(within the recording
and playback of music) is 'flat' important??