In Keynote the audio soundtrack for a whole slideshow can be set to loop, and if the slideshow itself loops, it continues along fine as I would like it to. The audio is just music and doesn't have to match slide contents.
Office 2003 have tried setting an audio file at modify slide transitions to loop until next sound. also... Under custom animation timing, and tried inserting a file to play automatically, set the the effect options to play for 999.
Basically tried every change I could find to try to get the sound to just play a continuous loop without restarting on the first slide. Which is my problem. Restarting audio is not the same behavior as looping in Keynote.
I must be missing something simple, and have to make this work for user editors that do not have macs.