Denon MC6000MK2EM Service Manual page 31

[3] Check the LED
When the MIDI command is sent from MIDI-OX, the LED lights/flashes/off/Dimmer.
(1) Select [View] menu - [Control Panel].
(2) These are explained in order of LED lights/off/flashes/Dimmer.
Example1 : When lighting the EFX.1 button on DECK A
In the MIDI-OX Control Panel, set the following parameters.
Control Event
74) Brightness
When the Enter button on the PC keyboard is pressed, the EFX.1 button on the unit lights.
Channel
1
31
Value
92