Perhaps this is unique to myself, but I have found that I can function amazingly well digesting something through Audio and working on something visually. I have no formal neuroscience education, but perhaps it's something to do with how the brain (or perhaps just my brain) processes various inputs and outputs.
http://en.wikipedia.org/wiki/Lateralization_of_brain_functio...
As a secondary note to the author of this app. What a great idea! I really like where you guys are going with this. I do find it hard to listen to as the narrator still sounds like a robot. But I'm sure with enough time this will be solved as well.