Have you ever tried listening to audio of a presentation with a slide deck? Have you found it virtually impossible to sync the audio with each slide? This world problem has been solved.
I believe you should be able to listen to the slide audio at your own playback speed and read the slide textual notes for each individual slide. Like no other app out there, I make the magic happen. Take that Evernote!!
I run on Windows desktop with aspirations to grow out of it. ;)