More Recordings, Please
There are a lot of words and sentences introduced that do not have audio. It sure would be nice for n00bs like myself to have more audio versions to listen to when attempting to translate. It helps to reinforce the learning.
The course has had audio issues from the beginning (this was Duo's first attempt at a course with a real speaker instead of a TTS engine) but have since been working on fixing it. We should hopefully be getting a new speaker soon (I recall reading something promising a while back, but it's been long enough now that I'm afraid that might have fallen through) and after that we may get more recordings. In the meantime, forvo.com and teanglann.ie should at least be able to help you with individual words. The latter even has separate recordings for each dialect, although they have not recorded every possible word.