Likely similar algorithms to what Ozone can do. You select a genre, a source option (CD, Stream, Vinyl, etc) and perhaps a few more and voila. Or you can purchase and select one Ozone's zillion presets. Ultimately it's whether you like the result or not. I reckon after paying $5 for enough of them you could just buy Ozone. I started with Ozone presets but now use its separate modules and roll my on.

Everything is so contextual. An algorithm can easily tonal balance your tunes by genre, roughly determine compression needs, give you the right LUFs for streaming or even "match" a reference song but does it match what you feel? Has it "changed" your notion of how the vocal or an instrumental performance should sound to you, etc.

Old man rant.

Bud

EDIT: just noticed that Mike had already mentioned Ozone.

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