I stopped using duolingo when I tried to improve my reading but I couldn't disable the text to speech. Apparently I was expected to unmute when reaching an audio question and mute before clicking next in case the next question is a reading exercise and I don't want to listen before trying to read.
That's a shame, I always find it hard to listen so I appreciate them reading it out, followed by me then reading it and connecting the two.
It would make sense to have it as an option though. One thing that bothers me is DuoLingo has all the exercises, but if I want to practice writing for example instead of a word bank I can't always do that. I can sometimes, sure, but not always. Would be nice to maybe have some customisability/control there.