Recording two tracks at same time

I want to record guitar on one track and vocal on another at the same time. At the moment I have two ways this might work: I have an Apogee Jam interface for the guitar and A Dual Tube audio inferface for the mic. Or, theoretically, I could plug the guitar into one of the two instrument/XLR inputs on the Dual Tube. When I use option one, with the two different interfaces (Jam and Dual) Logic Audio preferences will only let me choose one "device" as input. Not both. If I use just the Dual Tube with Guitar and mic plugged in to the L and R inputs, they go to the same track, since the Dual is seen as one single Input device. I cant even arm a second track for recording. The sound isn't bad, but I can't mix the tracks independently of each other. Any ideas how to come up with two separate tracks at the same time, or do I have to simply record the Guitar first and add vocals later? THat's what I've always done, but wanted a "live" feel this time. I just switched from Logic Express to Logic Pro X. Thanks in advance for any help!