I'm using Powerpoing 2003 and have sound files on several slides.  I am
setting up a slideshow for visitors to browse on a touch screen kiosk.  
However, I cannot figure out how (or if it is even possible) for the sound to
play when you go back to a slide that has already played once (which is
extremely necessary since many visitors will use the kiosk throughout the
day).  There were a couple of answers on the website but they contradicted
each other and neither one worked - one mentioned inserting a blank slide and
another mentioned inserting a slide with a 00:00 second transition but
neither one triggered the sound to work.  Please advise how to make sound
files (or narration) play every time, when a slide is viewed more than once
in a presentation.