While you are making a flash flipping story book or photo album, you may need to add background music to make the book vivid. You can add a song, music clips, or your recordings. To add background sound is just need a few clicks.
Set “Sound-> Enable Sound-> Enable” to show the sound button on toolbar, then click “…” button of the “sound file” option to choose a sound clip from your computer. Then set “sound loops”, "-1" stands for playing the sound file all the time while viewing flipbook, other value (N>0) stands for the times of playing the sound file.
You can on or off the background music by clicking the sound button on the toolbar.