Reply to Numark 4Trak custom map question

Ive seen the custom maps avail, and have a few of them tried out, but i want a mesh of many, so ive dived into learning the mapping.

Here is my specific question:

I mapped a free button to control the toggle of flux mode for Decks A/B. But...the LED doesnt come on when its engaged. Anyone know how i can do that on my Numark 4Trak?

Thanks in advance!