That's interesting, thanks for sharing. Does anyone know of a good solution for seamlessly switching between audiobooks and ebooks for books that are not bought from Amazon on Kindle?
In this case you already have the input file, and the audio output file but I guess there would be an app that takes these two files to provide a good reading experience. As they are based on the same source it should be possible to keep the reading progress matched between them.
It's using an oft-ignored part of the ePub standard, so I think all that should be needed for Kobo support is implementation of that part of the standard in KOReader.
Thanks, but clarification: I meant on iOS / mobile devices as I'm not reading on my computer. On second thought, it would be an amazing feature for https://prologue.audio, which is a beautiful app and works very well for audiobooks already.
In this case you already have the input file, and the audio output file but I guess there would be an app that takes these two files to provide a good reading experience. As they are based on the same source it should be possible to keep the reading progress matched between them.