You will need a microphone! The louder you talk the faster EdwardtheHedgehog spins but includes a script that will divide the loudness by 10 and spin at that speed if the loudness goes over 50 -- this is normally not a problem except when the loudness is at around 40 it can spin quite fast.
I tested this with a Microsoft LifeChat LX-3000 headset but any desktop microphone or inbuilt computer microphone should work!
