Some time ago, Kiwisplit started a thread about HiNative.com. There's an Esperanto section and he was encouraging people to check it out. I didn't quite get the purpose at first, but I created an account and I occasionally log in to check for unanswered questions.
Well, I just figured out (I like to think I'm pretty clever, but at moments like this...) that it has a pretty nifty feature which I haven't seen elsewhere. You can ask your questions about Esperanto (or other languages) in several formats - including a short audio file. I'm just noticing that you can also reply with a short audio file. So, if you want to know whether you're pronouncing Esperanto correctly, you can submit a short sample and get a reply from someone saying the same thing.