It has USB to transmit MIDI data. One of the settings is which MIDI channel you want to send.
From the manual:
USB COMPUTER port
Use a commercially available USB 2.0 cable to connect this port to your computer. It can be used to transfer USB MIDI data.
MIDI Transmit Channel Settings (MIDI Transmit Ch)
This setting specifies the MIDI channel on which the unit will transmit. This unit will receive all sixteen channels (1–16).