Ok. I've been using a stereo cable. I'll try the mono.
Not what I was saying. I was under the impression you didn't have a stereo cable. Either cable will work fine, but the stereo will sound better if that's what you have. So if you were using a stereo cable, why did you need a mono to stereo adapter? In general you should avoid using adapters when you can because you'll lose voltage and pick up interference.
Do u have to have the radio playing all the time or can u just leave it on the radio and turn down volume on radio?
Once you have the hardware set up, the radio will be on all the time, but you won't hear it at all.
The radio volume (before you plug the dubbing cable into the radio) will be louder than a normal listening volume but not all the way up. After you plug in the other end of the cable to the "Line In" jack on your computer, you should hear the radio output in your computer speakers (unless you have them muted) until you mute the "Line In" feed in your computer's audio settings.
Once you get it working to this point, you're ready to move on to the software portion, but we'll deal with that in another session.