After some time doing lessons, my audio seems to cut out. It stops working. I have to refresh, or log out and log back in, and the process repeats itself. Does anybody else have the same problem? Is this a bug?...
If you are using Windows 7, check Control Panel > Hardware and Sound > Manage audio devices > Communications tab.
These settings reduce the sound if there is other noise in the room. Try checking Do Nothing. It worked for me.