recording line input with automator?

Hello I'm wondering if there is a way to use automator so that I can record via the line input on my macbook which is hooked up to my stereos output? I'm away for a few hours tomorrow night and want to record a radio show thats not avail via an online stream.

I was thinking along the lines of having automator launch audacity then tell it to record but I'm not sure if thats possible or if I want to use it due to audacitys buggyness on intel macs. I'd try garage band but I unfortunately uninstalled it awhile back since i never used it lol.

Anyone have any ideas? Thanks