Sound panel cannot see external speakers

I have a couple year old imac upgraded to 10.5.8
I'm attempting to use external speakers via this path >> wireless to airport express >> optical to separate amp >> unpowered speakers. This used to work (maybe prior to upgrade to 10.5.8?), but now I
can get it to work ONLY using analog link from airport to amplifier, but not optical, and ONLY for iTunes. Itunes lets me select internal and externals speakers using the little icon on the lower right.
Video viewed via safari only allows internal speakers. If I go to preferences/sound/output it only shows the internal speakers as a selectable device. Could not find any way to add one so I assume if the system can't discover it you cannot add it.
I reinstalled Airport and tried to reset the PRAM (?). Neither hurt but didn't help either.
Any suggestions would be appreciated. I don't much care whether it's an analog or optical link to the amp, but I sure would like to hear internet sourced music via my external speakers.
thanks

I've tried each usb port and they still don't work.
So these are the older type that connect using USB, and not the "II" version that connects using the mini-stereo jack? I ask, because I thought USB version does not work with the latest Mac OS X. I guess it must work, based on what you wrote.
Since noticing this problem, have you shut down (powered off) the iMac and then started it back up? For hardware, shutting down is not the same as just restarting.
Some sound-related settings are stored in PRAM, so you can try resetting PRAM
http://support.apple.com/kb/HT1379

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