I bought off eBay a second hand line6 UX2 interface and when it came I installed the drivers for it onto my macbook air laptop (but not the POD farm). I went into Garageband and then plugged a Behringer xm8500 dynamic mic into the UX2, but I could not hear any sound being recorded into garageband. The only sound I could hear was a buzzing noise. I asked AI, but when I did what it told me to do, I still couldn't hear any sound. What can I do?