Cardas advertised USB Audio Cards on page 3 of TAS issue 203 (june/july 2010). I'm looking to find if any other lables provide this format for music. However, all my searches on the web for "usb audio cards" point me to sound cards for pcs that have usb access. Is this a one-of-a-kind for Cardas? Is there a different terminology for this format that I should search on?