You also can add sound to your animations. Before you can do this however you need to have a frame to attatch the sound to. Therefore you should add some frames from the harddrive or webcamera first.
When you have one or more frames you can add a sound by double clicking with the mouse on the frame to attatch the sound to. You will then get a menu where you can add sounds. When running the animation the sound will be played from this frame and until the sound is completed or the animation is at an end.
The only currently supported sound format is ogg.