Well first of all I'm new to all this audio recording stuff and would like to get into it. My friends wants to record a couple of songs but I want to know what all I need to make this happen. I need to know what kind of setup I need. Basically, he has beats/instrumentals of his own already in a mp3 file format. Now all we want to do is record over that. I own a 13" MBP and as you know it only has one connection for audio in/out. I would like to connect a couple of headphones and microphone to it but I don't see how, seeing that the audio in/out is all in one port. I could use a USB microphone to as my other option I assume. Is there any kind of adapter or module that will allow me to plug in the audio in/out port and split into a headphone jack and microphone input? Also once that is figured out is there a way for him to actually hear himself live with headphones on as he is recording? Sort of like the t-pain app for the iphone lol! I would appreciate some tips if possible!