I have installed eOS few days ago, and I found an error when I connect my headphones w/ mic. I hear a very annoying screech noise when I record. I tried to set as default the module-echo-cancel, but this crashes the sound settings app.
Something to note is that this doesn't happens always, and sometimes the mic just work fine. For example, I record something for the first time and it sounds good, but when I want to re-record the sound appears on the recording.