Noise from DVS mixer

[Eric Pena]

Hi everyone. Just bought a Tascam Model 12 not even a week ago and been loving it so far. Im using it to record some beats and scratches. I have a Numark Scratch mixer and when I Swith it to PC to use the DVS theres a loud continuos ring over the sound. Cant seem to find the problem. If anyone here knows I will appreciate the help. Thanks