The audio books and podcasts have been increasing radically in market impact and innovation, but involve production and distribution techniques quite different from what writers and publishers are used to: vocal talent, sound quality, equalization, compression, etc.
This is an area in which those who have produced or published audio format literature can share with those who are interested, but not as adept at the how-to.
And of course, audio writers are interested in venues, online stores and publishers of these "earphone books".
This is the place to ask, show, and tell.