Currently Being ModeratedApr 18, 2013 10:27 AM (in response to jcords)
Place the sound file on the slide and use Builds to change the images during the sound files duration.
Inspector > Builds > choose an effect
Delivery: by paragraph
more options > start build manually or,
use automatically; and select a delay (the amount of time the slides show). For example; if you have a 30 second sound file and 10 images, enter a 3 second delay.