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The hub is for convenience. Just plug the hub into one slot, and if you have 4 people, you can just plug all 4 instruments into the hub, and use either a wireless or wired controller to control the mic as well.
And no, there's no way to switch to wireless (unless you buy a wireless guitar).
The ps2 rock band came with a wireless guitar. why couldn't the 360 version have it too? :\
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