play slides for one song

How do you take a collection of slides and have Fotomagico self-time the slide transitions so that they can play through one song?

Once you have added all your images to the story board, and added a song to it as well, select the song, adjust it length to the slides by dragging the left and right end of the song so that the song spans all the slides you want to have. Keep the song selected and click the “Options > Match Duration To Audio” menu item. The duration of the slides will be adjusted to the length of the song.