Read Aloud Narrator Voices

Forgive me if this has already been addressed. I am interested in listening to ebooks on my iPhone or iPad , or even on my Mac. I do remember reading somewhere that the limitation is not with Logos, but with the limitations of iOS (though I don't know this to be true).
If there were any ONE feature that I would love more than any other fro Logos other than work on, would be the ability to listen to eBooks in a VERY natural voice (without hiccups or mechanical sounding machine voices), . . . . much like Siri does. If you can't use Siri, (which you may not be able to due to licensing issues), can you create a MORE realistic human-like voice for us to download, (we don't care how big the download file is, even if it's 2-3 GB or more).
Are there any plans to implement this feature, in a way that sounds far more natural?
What are you currently finding as the most realistic sounding voice, one that does not hiccup or sound mechanical?
Comments
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On my iPad/iPhone, I use Logos's Read Aloud feature with Ava Premium (which is a built-in iOS voice). 'She' sounds good enough for me, and the RA feature has always worked very smoothly for me.
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