The well-known practice of individually applying EQ to the mid and side channels is called mid-side EQing. EQs that use the mid-side (M/S) mode convert a stereo sound into mono and stereo channels.
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Mid Side EQ Tutorial in Mixcraft 8

Learn how to use mid-side EQ in Mixcraft 8 to clean up your audio, improve stereo placement, and achieve a professional mix. Focus on vocal mixing tips and techniques.
PRODUCER WEEK 2025: EQs come in all shapes and sizes, but the basic concepts are the same: take a signal with a distribution of frequencies, and output a signal with boosted or cut energy at certain ...