I've had the same problem mate but because I don't use the wireless guitar this problem stopped for me as I use the gh2 usb one. What you have been told is correct and I'm not sure why it isn't working for you. Try once more firstly pressing the little button the console so the light spins, then press the little button on your guitar controller and your xbox symbol should spin too..then both the console and guitar's xbox symbol should flash, showing that they have synched up. But make sure your xbox controller isn't on when using your guitar unless you want a vocalist who should be player 2, 3 or 4.