Adobe Captivate: Methods for Attaching Voiceover Audio
The Logical Blog by IconLogic
FEBRUARY 7, 2013
However, I wouldn't use this technique for voiceover audio. As for voiceover audio, I don't recommend that you add it to a project as the background. First, there's a production speed benefit. Keeping the number of slide objects to a minimum speeds up the production process significantly In fact, fewer slide objects means less time spent synchronizing the timing of those objects with other objects or voiceover audio.