Pronunciation in general
A really nice German speaker answered my question about a vowel followed by an "h" in the course of an unrelated discussion. It got me thinking that Duolingo would do well to have a simple pronunciation guide. There are very detailed online guides to pronunciation, in addition to detailed guides in dictionaries, diction books and the IPA. But it would be so fantastic if ANOTHER very nice German speaker would make a short list of long/short vowel rules, umlaut sounds, voiced and unvoiced consonants, etc. It would be great for all the languages. Some of us have problems with the recorded sound in this course.