About External device port

[NicoIntegra]

Hello,
I'm looking for some information about 3 external device port, it's usb but what can I plug on it?
I see I can use usb for midi, but it's the one for computer too, but what about these 3 extenal device port? Some controller?

[dboulden]

You can plug any external devices in here. Most likely will be USB MIDI controllers like keyboards, MPC style pads. You can also plug in a USB QWERTY keyboard and use that when typing sound names in.

[NicoIntegra]

ok, thank you for your reply!
I thought that I can plus TR8S on it avout to send midi from Fantom to it.
Finally my choice is: midi out1 for Integra 7 with TR8S on midi thru, and midi out2 for Montage 6.