External USB Sound Card and 6-channel 5.1 SS speakers not working

Hi. I purchased a few devices to expand my sound to 5.1 surround sound. However, I'm having trouble getting any results at all. Here's my situation.
New 24-in Intel iMac
Logitech G51 Surround Sound Speakers
PPA International External Sound 6 Channel USB device
I can select the audio device in the Sound control panel and under the Audio MIDI Setup utility. I have changed the device to be a 6 channel device, but I cannot get any sound to come out of the speakers at all. It could be that this particular USB audio device is not compatible, but since it shows up as a selectable device I had some hope that it would work. The device doesn't claim to be mac compatible, but that isn't always a requirement. I crossed my fingers and took a chance.
If anyone has any suggestions I would appreciate the help.

I'm almost certain it is because of the lack of a mac driver for this particular sound card. <gasp> This setup works great under XP when using BootCamp. If I'm dead in the water with sound card, are there reliable alternatives I look for?
Here are the links to the products I'm referring to.
The sound card:
http://www.ppa-usa.com/products/soundcard/1455.htm
The speakers:
http://www.logitech.com/index.cfm/speakersaudio/home_pcspeakers/devices/3549&cl=us,en

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