How to connect additional usb devices

Yes you can. Depending on what you want to connect an active (i.e. powered) USB hub would make sense.

Yes you can. Depending on what you want to connect an active (i.e. powered) USB hub would make sense.

I'd like to connect a second Touch Screen Monitor.  The 4 USB on our IonXe are currently:

1. Mouse
2. Keyboard
3. Touchscreen No.1
4. Eos 40x Fader Wing

Will a passive USB Hub work fine for that?

You might also consider daisy-chaining the 2 touch screens. Keep #3 as above and then connect the second touch screen to a USB port on the first monitor. 

combine the mouse and keyboard on a passive hub then that leaves a port free for your 2nd monitor