hey I've been using ACID for a while now and for the last couple years I've been having this same problem. When i record my vocals i can hear the beat too. I tried turning down the volume on my headphones and balancing the sound to one side of the headphones but it don't work. I can see the sound levels going up even when i'm not in the booth. I did research and i see my problem could be as simple as recording on a different channel. I still can't figure it out. may someone help me? i have ACID10.