I just purchased a iBook and there is no place to put a direct audio in to record with/ but on the powerbook it says it has a analog audio in/out but where is the plug ive looked on the pic's cant seem to find it, does the headphone jack double as a mic and headphone at the same time? does the ibook have this feature as well? im wanting to do some low-fi garage band recordings of some songs and wanted to use my ibook without buying a interface, the MicPlug looks pretty tempting though, can anyone shed some light on this for me