JL Audio MCS-3800 - Manual (Page 24)

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LED Behavior in Special Mode
The LED can appear to behave either momentary, or latched.
Momentary means the LED is lit only while the button is
pressed. It turns off when you release the button. Latched
means that the LED turns on with the first button press, and
then turns off with the second button press. Alternately, the
LED can flash, or do nothing. It is up to the host system.
The most important thing to understand about the Special
Mode, and the fact that the Special Mode turns Local Control
Off, is that two way communication with the host system is
required for a special mode to operate. In other words, special
mode will not work unless there are (in the case of MIDI I/O)
two MIDI cables connected, or a 422 connection.
If only one way communication is established, and the MCS is
in Special Mode, then it is possible that the unit will appear to
not work. Either the displays will light, but the MCS will not
control the software, or, the MCS will control the software but
none of the LEDs or LCD will light.
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To Assign a W or Cursor Button
Since the W and the Cursor buttons are Shift-able, first check
the state of the Shift button, before entering Assign mode.
In other words, to assign W1 only, make sure Shift is off.
If you want to assign the command to be sent when Shift W1 is
pressed, make sure Shift is on.
Press Assign to enter Assign mode. The yellow LED is lit.
After entering Assign mode, pressing a W or Cursor Button will
select that control for editing.
At that point, the display “holds” the currently selected control.
If you change your mind and wish to edit a different control
instead, press Assign to exit assign mode. Press Assign again to
re-enter Assign mode and select a different control.
Use the LCD and rotary encoder knobs to edit the control.
Turn the right-most encoder knob to reveal additional editable
parameters.
After making the edit, press Enter on the Keypad to store the
changes to memory.