Be sure to watch ALL the videos in that link Greg gave you....start to finish.
I seem to recall that in them they do touch on the PRV and Staff somewhere.... ( not 100% sure )
I don't use PRV but I do know that several folks do and what I do recall is there is a learning curve associated with being able to do all that you want to do..... knowing where the functions are, and how they work.... same deal in Staff editing.
Also, you can search YOU TUBE for more videos on PRV and cakewalk products. Quite a few people have produced some instructional videos on cake stuff.