I had an issue with the audio portion of the book, but was able to resolve it after contacting customer service. It seems that my IPad device was on mute all along. Even though I was able to listen to my music, I was unable to get sound for the book.
Eric, from Disney Digital Books responded to my email with the following solution:
"Double-click the Home button, which will bring up the multitasking bar. Then flick the multitasking bar from left to right until you see play, forward, and rewind icons. If the icon on the far left looks like a speaker with a line through it, that means the device is muted. Click the icon to unmute the device."
Hope this helps others who have written they are having problems with the sound.
Soniasan954 about Brave: Storybook Deluxe