Older versions of unrealBook recorded in .caf format. Unfortunately, iTunes does not directly recognize this format. To convert .caf to something like .mp3, use MAX - a free OS X program or Switch to convert the files (cross platform). You need to dock the iPad to a computer and use the iTunes document sharing panel to drag the .caf files on to your computer before dragging into these programs.
When I ran Switch it gave me an error, but still converted the .caf to .mp3. MAX works fine but you need to set the destination file type in the preferences before it works.