Hi there.. in simbuild , this is my second project. ( already done mcp working beautifully) with zero knowledge, just finished my FMC, programed, etc and now have to connect the extras wires. ( 5 or 6 if not mistaken..I know that we need to "expand" our mega2560 to extra buttons and connect them,but I don't have idea how. Anyone can give me a help with this issue!! thanks in advance.