Aha! Just tried two usb devices into Cubase (essential 4) and neither show.
One is a Dazzle video capture device and the other is the Behringer UCA-202 interface.
The only way to get Cubase to "see" a generic driver usb audio device is, AFAIK to "wrap" it with ASIO4all.
Both Audacity and Samplitude silver found the "USB AUDIO CODEC" bish-bosh.
Personally I would use a simple DAW like Audacity and then export the .wav for treatment in Cubase.
Rewire maybe? I have never had much luck with that myself.
Dave.