I have an M-Audio Rev. 7.1, and I wanna get a mic for this thing, but it takes a digital mic. I don't know what the difference between digital and regular mics for computers. I imagine digital is better quality, but more expensive. Basically for my needs, I don't need more than what a normal mic can offer. Is it possible to get an adapter to make a normal mic work on this thing, or am I gonna have to go get a digital mic?