Anyone with android/samsung. I finally got the text to speech feature to automatically change between Japanese French English Chinese so I don't have to change it constantly.
Go into settings. Accessibility. Talkback. Settings for that. You should finally see text to speech settings, click that. Click the gear icon next to Preferred engine. Click Install Voice Data and Download ALL the languages you want text to speech and pick the voice option you like. Then go back. Now pick Language Detection and select Aggressive. Now it will read different languages even if you are only set to one language by default (which Samsung makes your device set to only 1 default language).
Now it will switch audio depending on what you read without having to manually go in and change it.




















