Beaming music from computer sound card to FM band of stereo system

[bsa]

I am trying to broadcast music (Rhapsody) from my computer to an FM channel on my stereo using a "Beam It" device. I have a Soundblaster "Live" Card in the computer (about 4 years old). The output from the computer is digital so I am just picking up hiss on the stereo. Any ideas about how to work around this would be appreciated.