My problem is that when I record any electric guitar by micing the amp, the sound plays back extremely distorted and muddy sounding, to the point that you can barely hear what is being played. I get great sound when I mic my acoustic guitar though. When I record, I mic the amp, and the mic goes into my M-Audio mobile pre usb which connects to the line in on my macbook. I suspect it is something to do with the macbook, because I have used this exact method using my other computer and have received great results. The reason I am trying to get this to work with the macbook is because it is much more convenient. So is it a soundcard issue or something? Is there any new software I need to buy in order to make this work?