I was thinking the "remix" type looks a bit out of place. It's essentially a subset of "arrange" (=music based on another), plus when a track is a 'remix' is often a personal appreciation and doesn't give much actual info to the users. I'd rather stick the more general "arrange".
For example why is
this album "arrangement, remix"? Are some tracks 'more arranged' than others? Just because of its name?
I agree with Cedille that we could add a classification for those albums that are meant to represent the OSTs but sound different/better like FF12 or many DS OSTs. Maybe "remaster/original"?
Also "Sound Effect", "Voice Clip" could be combined in one like "Sounds" for conciseness. Doesn't seem there are that many cases to have them separated.