One of my projects for 2018 involves scoping the possibility of reproducing a range of printed/visible work in an audible version. Some of these are actually technical in nature, so this got me to thinking about the user experience of users listening to this content. Users may suffer from visual impairment, but many may simply opt to listen to this material rather than read it (e.g. it's easier to listen to while driving to/from work, etc).
There is a lot of research into page layout methodologies and the flow of design elements (text, diagrams, etc) such as the Gutenberg Diagram, Z-Pattern, F-Pattern, and so on. I'm also aware of other questions such as Page layout - authoritative research into natural flow of text, tables and images.
However, all of these relate to the design of printed and/or visual content. This question, on the other hand, is about audible documents (typically audio books).
Note this question is not about podcasts per se, but about the audible representation of existing visible content such as novels, text books, reference materials, etc.
Obviously, there's quite a bit to this topic, hence why my question is asking for references to any research (if it exists) on best practice for creating audio versions of pre-existing printed content.