Free ways to listen to EPUB files at 400+ WPM on Android?

Hey everyone,

I'm trying to listen to EPUB books at ~400 WPM (or faster) using free, offline (if possible) TTS on my current Android phone.

I used to love Moon+ Reader paired with old Ivona TTS voices (they handled high speeds really well without distorting), but on my new Android phone, I can't install Ivona voices anymore due to compatibility.

Google's default TTS works, but cranking the speed slider past 25 on Moon+ Reader makes the pitch rise weirdly and comprehension drops hard. I've also tried SherpaTTS Piper / Coqui models, but they have noticeable delays generating each sentence, so at high speeds the pauses feel way too long and break the flow.

What would you recommend for listening to ebooks on Android at high speed?