Replying to Rode videomic t3i uncompatible?

Well i received my rvm a week ago and today I decided to try it but as i plug it in , and go in the audio settings , it goes all the way to the max and i can only hear a huge screeeeech . Still in manual mode , on the lower volume level in the audio settings , i only hear the same sound and almost nothing of my voice . I read on dat web about AGC but looks like i cant disable it on the t3i. Did it happen to some of you? What did you / could I do to solve this? I cant hear absolutely nothing ! Could it be a defect ?