Raptor 352TS buttons

[bugwest]

Hi.
Does anyone know what the middle button in the 2017 Raptor 352TS does? Also, above the three vertical buttons is a faceplate with a bump in the center. What's that?
The top switch moves the hydraulics on the bed. The bottom switch turns the light on. The middle doesn't seem to do anything.
I switch it and nothing seems to happen .

[JRTJH]

Possibly the outside "big round scare light" or the front "mood lighting" on the nose cap ????

[bugwest]

My 18 y.o. son just came in and figured out it can turn the speakers off if you have music playing in there.

Still don't know what the nodule is above the three switches