Comprexxor: Analog-Style Compressor Plugin by IK Multimedia

Comprexxor features eight selectable ratio curves. Each ratio has its own threshold setting, so the threshold adjusts automatically when you change the ratio. The 1:1 setting adds warmth without compressing, while the MAX setting produces a strong brick-wall limiting curve.

The optical mode turns the attack and release controls into an opto-style compressor. The GB mode and the first ratio setting can be used for distortion-like grit, so the plugin works beyond level control on any track.

The color section adds 2nd order harmonics, described as tube-like, or 3rd order harmonics, described as tape-like. Dedicated controls set the amount and tone, which makes it practical to warm up digitally recorded tracks.

The advanced sidechain section includes two adjustable filters. You can focus compression on the frequencies you choose before the signal reaches the compressor, which is useful for controlling bass or taming harsh midrange.