You can add slide notes and convert them into an audio file using the text-to-speech converter in Adobe Captivate. You can also convert slide notes to closed captioned text. Unlike slide notes, closed captioned text appears on the slide during runtime.
You can also use slide notes to communicate with users who do not have any audio equipment or are hearing impaired. Slide notes are a good location for adding extra information about a slide, such as numerical details, supporting materials, or footnote text.