Tank Drive with Advanced Framework in Labview

[finman]

i have successfully implemented a tank drive system with the basic robot framework in labview, but i have not been able to do so with the advanced framework. i am still having a little bit of trouble understanding where all of the variables are stored in labview, in particular the "joystickdevref". i figured out how to add a second reference for my second joystick in the global variables vi, but it won't change to USB2. after i change it, save it, close it, and reopen it, both references say USB1 again. does anyone know what my problem is? also, can you explain exactly what the joystickdevref variables are?