Replay A/V is great for this - it has a "Record What you Hear" feature that records anything that your speakers are playing.
Try it for free here:
Replay A/V - something I really like about this company applian, you can buy their software risk free and return it for up to 30 days if you're not satisfied with it. The good news is, I've been able to try ALL of their programs, but the bad news - I love them ALL and haven't returned anything, LOL
Let me know what you think!
MG