We (LibreTexts) have hosted audio files of OER books on our Commons&Conductor system where all ancillary assets for books are stored. However, I have been conflicted about hosting static audio files since that reduces the dynamic nature of the book/pages. If one wants the audio files to sync up to the text version, then one has to edit the audio files each time the text is updated and that is an onerous activity.
We have looked at dynamic audio generators to “compile” a book’s audio output after editing and gotten mixed results, but that was two years ago. The explosion of AI based technologies suggest this should be better now or will be good enough in the near future. Plus, this may be useful for polyglot applications, which is dear to our hearts right now.
I’ll take a look at this next week and perhaps I can give an update on the efficacy of the current state of these tools now.