Mid-side

Mid-Side (or M/S) processing is a mixing and mastering technique that separates a stereo signal into two components (the Mid and the Side). This allows you to process the center and sides independently, giving you control to widen the stereo image, clean up the mix, or make surgical adjustments without affecting the whole signal.

• Mid: the center—what both left and right channels share (often vocals, bass, kick…)
• Side: the differences between the left and right channels (stereo effects, ambient sounds, wide instruments)