Airport Express appears as an option in iTunes but sound only plays on comp

I used to be able to play itunes music through my computer or through an amplifier connected to an Airport Express. Since upgrading to iTunes 8 there is a third option displayed in the lower right portion of the iTunes window, "multiple speakers", but now, no matter which option I select the music plays through my computer and not through the remote speakers connected to the amplifier. Any one else have this problem? Any solutions?
I have turned off IPv6 to no effect. The Airport Express seems to be functioning normally as a wireless network. I have changed the iTunes preferences with respect to controlling sound in remote speakers with no effect.

There is a 3.5mm standard headphone audio output on the bottom of the airport express. If you plug speaks or headphones into this port while airport express is selected in iTunes, you be able to hear your music. Usefull if your destop is in one room and you want to hear music from it in another room where the airport is located.

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