Roland Fantom XR Owner's Manual page 152

Connecting to Your Computer via USB (USB Mode)
What is the USB MIDI Driver?
The USB MIDI Driver is a software which passes data between
the Fantom-XR and the application (sequencer software, etc.)
that is running on the USB-connected computer.
The USB MIDI Driver sends data from the application to the
Fantom-XR, and passes data from the Fantom-XR to the
application.
fig.23-006
Application
USB connector
USB MIDI
Driver
USB cable
Computer
USB connector
Fantom-XR
152