I've been asked to put a friend's poetry to music - which is hard enough when you're well out of practice!! - but I now would like to record a basic demo for her. I have developed a rhythym guitar track, a drum track, bass line, organ wash and piano parts but of course I cannot play everything at once...
i have PA equipment which I intended to take the line out into a computer but I'm quite new to digital recording - alright, complete neophyte! - and have a 1 year old mac with garageband; do I need some sort of interface between the two?

My sincere apologies for the slight hijack, but the recording gurus are about in here so this is me striking while the iron is hot....