I bought and built a Blackbird, and I had some questions for the people with more experience with keyboards. What is the 8th led on the top left corner for? As far as I can tell the order of the LED are Num lock, Caps Lock, Scroll Lock, Layer1, Layer 2, Layer 3, Layer 4, and ?. I used sip sockets, but I can't seem to get it to light up. I accidentally hit with my soldering iron, and it lit up, but I'm not sure why. How many leds are supposed to light up when you push the fn button? What is the difference between MFN, and FN1 when programming the board?