Hi guys, I recently bought a brand new MacBook Pro 13", and have been very frustrated with the quality of the internal mic when I am playing my guitar into it. For about the first 3 seconds of my playing, it sounds ok, then it fades to a point where you can barely hear the guitar. is there some microphone setting I forgot to select? or do I maybe have a bad egg? Lol please help! Note: Vocals seem to pick up fine on the mic, its only the guitar playing that is of poor quality. Thanks.