I've created four different presentations. They vary by style (theme) and orientation (portrait vs. landscape). I want them to flow as one automated presentation -- no mouse-clicks.

Linking from one to another looks nearly impossible without mouse-clicks.

Saving as a movie and then splicing them together doesn't seem to work; the movie versions show the sound icons (i.e., don't play the slide show).

Any suggestions? Help is needed and appreciated!