If you're using Riffworks with POD Farm, you're most likely using your UX1's instrument input and routing that through the POD Farm modelling application, then into Riffworks to record the signal.

Your UX1 would have to be set as the ASIO or Core Audio device in Riffworks... which means at the very most, you could plug in a signal non-phantom powered Mic into the Mic XLR jack of the UX1, create a 2nd tone (DUAL TONE) in POD Farm and then route that single mic signal (mono drums) into Riffworks.