What is the proper use of ReaPitch in my situation?

Anothe way: Select all the music track items and hit Shift-9 or Shift-0. (Not the number pad, the ones above the main keyboard). 9 shifts one half step down each time you press it, and the zero shifts up.

GREAT! Thanks everyone! ...... 

I am very grateful for your contributions to this conversation. It has helped me learn so much in a short amount of time! How long would all of this take Kenny Gioia to explain in a video? (Ha Ha Ha Ha!)