Have you tried driving entirely in reverse?
Maybe cover your truck from head to toe and front to back with deer whistles so the light bar noise is a thing of the past
Try matching the sound with your own puckered lips while you drive around
I read somewhere cutting an inch thick foam and insert them on the fins of the bar.
Was thinking the same thingNot sure I'd be to happy to do that... Those fins allow the bar to breath so it doesn't overheat, even if it is led, the bar can still overheat in the summer...