Freeware - Bakuage ClearMixer VST Plugin

https://www.kvraudio.com/product/clearmixer-by-bakuage

ClearMixer is a VST mixer that automatically reduces interference in your mix. This is ideal for those who want to easily perform a mix with less interference. Why is it necessary to reduce interferences? When there are multiple sounds that have the same frequency, the sounds are muffled. Since it is normal in nature that sounds interference with each other, humans can recognize multiple instruments even if the sound is muffled. However, if there is little interference, it will be easier to recognize each instrument. If you create a less interference mix, you can make a clear mix. ClearMixer reduces interference between 16 tracks automatically. ClearMixer detects interference among multiple tracks in real time and automatically reduces it. Even cases where the interference exists only for a specific timing can be handled automatically.