Crap... I did some more digging, and found the answer.
"Does Bass PODXT Pro support Models Packs?
The Bass PODxt family of devices was built from the ground up with the most important features for bass players in mind. They are completely unique and different in design from the guitar family of (Guitar) PODŽ xt Products. As a result, at this time none of the Model Packs are available for Bass PODxt or Bass PODXT Pro."
Which makes you wonder, if the Bass PODxt is so great because it was designed just for bass, how great is the regular PODxt when it is used for bass with the bass expansion?
(I'm being sarcastic... I think this is their way of saying, 'We don't feel like expanding upon an item that isn't popular.' Which is fine.)