TheSteven
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And now - "We're recording in not only surround but height" - wow.
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One thing to consider is that the higher the frequency of a sound, the more it radiates up as it moves away from the sound source. This is why, for example, you stage a choir with the highest pitched voices lower, with successively lower pitched voices standing behind and above in ranks. Look at the micing of this choir. I would have used an ORTF pair centered and back, but that's just me. And I would have positioned the choir differently.
So why could this be useful in a drum mix? I think this would give you some control over the high frequency content (from the harmonics from the cymbals, for example) that never existed before.