So I have had an iMac for a few years and I started messing with GarageBand. I figured out how to auto-tune and change the pitch of my voice but I was wanting to go on webcam sites such as Chatroulette, Omegle, and Stickam and use the modified voice I made in GarageBand as my voice to have a good laugh with random people. I have the Monitor on with no feedback protection but when I talk to people on those sites they can still hear my actual voice. P.S. I use headphones with the microphone on it and I used the built in microphone and none of them work so please help me.