If your favourite book isn't available as an audiobook, give us a try:
I tried to order, but it errored out because of some file not readable error, but error was fatal and with no recourse but doing everything again.
I would use this all the time if it was a little smoother. Hit me up if I can be helpful. (see my profile here for email)
They quickly reached out to me with the fixed file and the output is really good.
This is the first voice synthed audiobook that I can actually stand to listen to at length, and it plays well using Podcast Addict on Android, and the voice speeds up well too (encoded at 93%, listened to it at ~1.7x)
That uses Speech Synthesis Markup Language (SSML), which can achieve realistic pauses gaps in speech.
Nice work though!
Auditus looks like a great idea.