I am using Rosetta Stone Network V3 on an early 2011 MacBook Pro running OSX Lion 10.7.3. When I log in, select a language and level, and then a lesson, I am prompted to select a microphone. The built in microphone doesn't show up, yet I've used it multiple times for other applications. I heard from another user that it doesn't work if headphones with a built-in microphone are used. I have not yet tried a USB microphone.
Is there some free work around to this? I would prefer to not have to buy a USB microphone, but if that is the only solution, then I'll live.
Edit: I noticed that Rosetta Stone tells me that if I don't have a microphone I should disable speech to move on, but that option is grayed out for me.