M
M
M
X
X
X
-
-
-
3
3
3
U
U
U
B
B
B
/
/
/
M
M
M
X
X
X
-
-
-
4
4
4
U
U
U
B
B
B
/
/
/
M
M
M
X
X
X
-
-
-
7
7
7
U
U
U
B
B
B
40
(3) Press the NO.2 key of the output channel, then the input channel will begin to flicker.
Key
LCD Display
MX-3UB
MX-4UB
MX-7UB
(4) Press the NO.2 key of the Input channel.
Key
LCD Display
MX-3UB
MX-4UB
MX-7UB