[CentOS] mp3 recorder?

I have my tape deck connected to my PC's line-in port, but Audacity's 
unstable release is unable to pick up the audio, though when I select the 
proper device and play with the volume control in the app, the audio does 
change.

What other mp3 capture programs do people use?   My goal is to simply 
capture each side of a tape to mp3, then use Audacity to break each song 
to its own mp3 file.

Thanks.

Scott