So another project I have at my other department will be updating the older style Fed Signal LEDs with more updated Whelen 600s. The lights are a direct swap as they're both 6x4 lights. The issue I have is I need to change the flash pattern on the current setup the truck has. I need to set it to either a slow single flash or steady burn pattern. I believe I've located the flasher modules but I have never seen these before. I think it's the ES-Key Class 1 system. I have no idea how to change the flash pattern on this thing. Any of you ever seen this before?