Comentário oficial
The purpose of the DVS pack is to primarily allow control of the software via vinyl, but also offers owners of CDJs which do not have USB control (eg. older CDJ-1000's) to use timecode to manipulate the software when using a DVS-compatible mixer.
As you're using an RZX, DVS functionality is really not needed, but available as an option to you should you desire! There's nothing else that is added to the software with that plus-pack.