Hi! My microphone has stopped recording well (on Garageband for instance) and my friends on Skype say they can't hear me very well (sometimes they can't hear me at all) I have unchecked the "ambient noise reduction" box under preferences, but now, even though my mic actually picks up more of my voice now, there is a lot of ambient noise whenever I record something. How do I get rid of the noise pollution? It seems I can either have a clear but REALLY quiet sound or an ok- sound with a lot of noise pollution. HELP! Thanks!