[PLUG] Audio in?

[Dick Steffens]

I have an old boom box and some audio tapes. I'm trying to run the 
headphone out of the boom box into the computer. I've tried the mic 
input on the front, and the back of my desktop, but none of my recording 
software finds the sound. I'm using Audacity. I also tried Audio 
Recorder with the same results.

Please apply the appropriate clue stick to let me record some audio from 
an external source.

Thanks.

--
Regards,

Dick Steffens