MAGC
MAGC is a simple but powerful utility that adjusts the loudness to match the side-chain.
Make sure your processing chain doesn't change the loudness, or just be creative...

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An affordable way to get MXXX. It is cheap and you can buy only those modules you actually want.
A unique plugin which lets you apply a panorama to each frequency individually.
Compressors, expanders, gate... Amazing sound, easy-to-use interface and ultimate versatility.