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The Calf Sidechain Compressor doesn't work like you would think. It has filters that allows you to use a subset of the frequencies of the full stereo input as the compression signal. It works best if put on the master bus. In this case the full (filtered) mix is used for the sidechain input.

From the Calf manual: If you cut all lower frequencies from your detection signal the compressor will decrease the volume of your track only if some loud highs appear.