Adding sound
Click the note icon to open the background music list. Then click the plus icon to select music files. You can change the order in the list by using drag&drop.
For an exact adjustment of the music songs will be displayed as a wave in the bottom track of the Timeline. Here they can be moved, shortened, overlapped, and you can adjust the volume by using the volume rubberband.
Note: Sounds are not background music. You can drag them from the Toolbox directly to the Timeline or assign them directly to an image. There are no limitations to the number of sounds that can be played simultaneously.
If you like to learn more about background music in SlideShow 9 you should look at the "Background music" chapter in the online help.