case convertion sentence combination

I can't sort out how to combine a Case Convertion in 1 field.
Example:

I have the file, in this format:
06. Paul T - Can I Get Some (Original Radio Version).mp3

In the title-field is in this format:
Can I Get Some (Original Radio Version)

What I would like is a function that would give me this end result:
06. Paul T - Can I get some (Original Radio Version).mp3

with in the title-field of course:
Can I get some (Original Radio Version).

You see, I'd like a combination of a sentence and Mixed Case.

Somehow, I only seem to be getting:

  • Can I Get Some (Original Radio Version)
  • CAN I GET SOME (ORIGINAL RADIO VERSION)
  • can i get some (original radio version)
  • Can i get some (original radio version)

Who's got the trick...?