I answer the question in the first minute. But stick around for the more interesting question, why do we still bother with it?
Once again, a method used to solve a technical problem with analogue recording has survived as a creative option in our modern DAW mixing environments.
The star of the show is U-He Satin, with its very useful companding features, but the principle can be used with other non linear plugins as well.
Here's the older video I refered to, Emphasis and De-emphasis EQ:
https://youtu.be/H-Gs-o39C5o
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U-He Satin (Gear4music)
https://tidd.ly/3DMykXq
Video edited with VEGAS Pro 17:
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