Cubebase LE 5 USB MIDI

Is it possible to connect a Midi controller to cubebase le5 via usb?
I have a lexicon alpha a/i (with asio alpha)




Edit: more info regarding problem.
I have an alesis q25 and a midi connector. The lexicon alpha a/i does not have a midi in/out port

Connect the Q25 to the computer via USB.
Cubase should automatically see the MIDI ports.

oh haha thanks. Restarting cubebase did the trick.

On a side note, does the cubebase le5 tutorials that came with the installation cd include midi tutorials, or should I look elsewhere?