No, you can't. It's just not supported yet. When the bluetooth microphones come out you will be able to use more than 2 mics.
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No
Yes. Guitar Hero: World Tour is compatible with all USB microphones, but the in game tutorial suggests that the GH Mic is the best, but what difference does it make?
Make sure you have it plugged in the USB port and also have a controller plugged in a controller port.
not according to the singstar booklet. says only official singstar mics can be used
You should be able to use a singstar microphone with band hero. The developers designed the game to support any usb microphone.