I have a very basic setup for home recording. I use Garageband with the Alesis iO2. Recently I got 2 microphones: the AT4040 and the AT4041. I tested them the instant I got them and everything was fine. All of a sudden, Garageband no longer receives any signal from either mic. The signal gets to the interface but doesn't make it into Garageband. I've played with both the Garageband preferences and the Apple preferences for both input and output and nothing works. What am I missing?