Ok so I found a work around - if you have moonreader pro when you go to start tts it gives you the option to set a time limit. Next to that is a little gear icon. If you click that it takes you to the tts settings in android system and you can change the default engine. Google tts is working beautifully, much more functional than onyx tts. Strangely, if I go back from the system tts menu it takes me to the language and input menu, but there is still no tts option there, so they must have hidden it. Too bad to make this so hard to fix.
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