A refix is usually a remix, edit or recreation of a track, and should therefore be in lowercase.

While you're at it, "inna" usually stands for "in" or "in the", so that should be lowercased, too.

"Re-edit" should be "re-edit" and "Remaster" should probably be "remaster".

"Dub" should probably be only lowercased at the end of a parenthesized phrase, since out side of that, it more likely would refer to the genre.

(Unless we abandon that system and save everyone lots of time while making the titles look cleaner, but unfortunately that's not gonna happen...)