> I understand there are "USB soundcards" out there not even 
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> appearing as USB Audio class devices.

Yes there do exist some devices that depend on vendor supplied
drivers, however there may be hope for this device:

http://www.lexiconpro.com/knowledgebase.php?product=7

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> Q: Will the Alpha work on an Intel based Mac?
> A: The Alpha will work on Intel based Macs with OS version 
> 10.4.7 or higher. The Alpha uses Mac's built in Core Audio 
> drivers.

That does indicate a uaudio device, however that may not be the
case.. try contacting them directly, or keep the receit.

-Bryan.