addition:
I do not connect the 5 pin ports to the computer! this is senseless. For this you would need a separate MIDI interface... and then you do not need the USB connection...
I have about 30 synths running in two rooms, some with USB and MIDI (like the XW), and a lot older with "only" MIDI. Don't get me wrong; I'm a Casion fan, I have buyed all professional synths and samplers (CZ1, CZ101, FZ1, 2 x FZ10M, VZ1, VZ10M, RZ1) when they came out...But none of them ever made such a mess connecting to the studio environment.