Hey, i have The Beatles: Rockband for the wii. I also have 3 mics, the one it gives me, and two 3rd party ones. But i can't find any way to get all 3 mics plugged, with use of all other instruments. One dongle takes up one port, the other dongle takes up another, but has 2 open ports on the back. where does the 3rd mic go?