^^ Well, yeah, you can run music through some algorithm that'll try to decide for itself how best to play it back to give the impression it was remixed, but results will vary greatly. It'll *never* sound as good as it might if a qualified sound engineer made the decisions and worked through the entire process carefully. And there are artistic choices an automated process simply cannot make.
As has been mentioned above, most music produced today targets a stereo mix. You can *try* to magically upgrade that, but the end result will be extremely subjective. Some might like it, others will think it's horrible.
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