You're best muting your monitors while recording, as a microphone will pick up the sound from them and recycle it back to them over and over again until they mount up to a loud buzzing or screeching... much like you'll get with excessive use of a delay effect. Record using just the headphones, and be sure to disarm any tracks for recording before turning the monitors back up. That is, if it's feedback you're experiencing. When you say 'buzzing', perhaps it could be a faulty wire somewhere? If it only comes to the fore when you're recording, I'd check all guitar leads, mic leads, basically all the inputs INTO your MBox or interface. Hope that helps. Bit of a novice myself, but you know yourself, you learn more in the first few weeks than anytime else!