Hi uglee,  I’m not sure about this, but seeing that you have no replies so far, at least some ideas I would try (I will check put later if that‘s the case on my Bass Pod XT. I usually use it on my Mac via USB only or wireless on my amp.)  Did you check the DI/Model setting in Edit/Gearbox? What happens if you plug in a cable to Model output? Are the sounds on both different? Why isn’t a 5-pole an option? Do you need the USB sound on your computer at the same time?  For a), as written, I’l look int this later here.  Best Uli 
  
P.S.: I’ve done so. Yes, you’re right: The moment a USB cable is plugged in DI output switches to model, and it doesn’t matter whether a second cable is plugged into Model output or not. 
Have found no way to make it work correctly.