How do I monitor the Line-In Sound?

I'm connecting my stereo receiver to the line-in sound jack. I know it works because I can record (and monitor) the sounds through Audacity. But,is there a way to listen to what's coming in without opening any app?
I think it's the same question as here: http://discussions.apple.com/thread.jspa?messageID=676560&#676560
and that didn't get an answer...
Thanks

You need some kind of application. The simplest is LineIn
<http://www.rogueamoeba.com/freebies/>

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