I just bought a reel of WS2812 LEDs and I would like to use the Unicorn HAT to drive them, since it contains the 3.3 to 5V level converter and an EEPROM. There are connections on the board for Vcc,Din,Gnd. Are these at the start or end of the chain? If at the start, is there any way to turn off the HAT LEDs, even if it requires drilling through the board at an appropriate point? A circuit diagram would be helpful here.