I often record live performances and town hall meetings with an older Mac powerbook, using the audio line in port, direct to a line out on the PA board, and ProTools. My daughter's iBook has no line-in, so I use an iMic from Griffin allowing the line out form the PA board to USB on the iMac. No problem either way. Of course, there are only two tracks, but I've never needed more on a live performance. Dan Scanlan Grass Valley CA