My Mac Book Pro has a mini-jack headphone line OUT socket, and a mini-jack mic line IN socket. Not all Macs, I believe, have both, and it sounds as though your is one of these.

I use a mini jack-tojack cable to connect my Sony Walkman cassette player to the Mac - with Audio Hijack as the inputting program, and everything works fine.

If the worst comes to the worst and you have a problem, PM me and send me the tape and I'll gladly copy it and burn you a CD.

Will