Edirol UM-1EX Owner's Manual page 36

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THRU switch ON/OFF setting
You can use the THRU switch to switch the destination device for MIDI messages from the MIDI
keyboard or digital piano connected to the MIDI IN cable. There is no need to change any cable
connections.
Switch Setting
OFF
ON
fig.connect-change_e
* Don't change the setting of the THRU switch while you're using the UM-1EX. Doing so will cause MIDI
errors.
36
MIDI Message Destination Device
MIDI messages are transmitted to the computer (sequencer software).
MIDI messages are transmitted to the MIDI device (e.g., MIDI sound mod-
ule) connected to the MIDI OUT cable.
MIDI Message Flow (THRU OFF)
MIDI Message Flow (THRU ON)