Mid/side processing: what it is, why mono still matters, and where it helps in mixing and mastering
Mid/side (M/S) is another way to describe a stereo signal: the sum of left and right (mid) and their difference (side). This guide explains the maths in plain words, why everything you do to the side channel vanishes in mono, and the handful of mixing and mastering moves where M/S earns its place.
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