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Ok, I know that this thread looks dead but in case anyone is still looking to do this I found an easy answer. I was contemplating changing out the NuTone 4006 to something else but wasn't thrilled with the available options. When I took the unit off the wall to look at it, I noticed 3 RCA connectors on the circuit board on the back. By trial and error I figured out that the bottom one is the "phono" connector. All you have to do is get a cord that plugs into your music device of choice with an RCA plug on the other side. Set the unit to "phono" and you're done. Now I'm thinking of running the cable to inside the cassette deck and modifying the cassette deck so it holds an iPod or whatever you use. I was thrilled to death when I saw how easy this was!