Ok, I've been mixing for about 3 months now, and ever since I started, I've been getting this annoying bassy sound coming from my speakers when I start mixing. I was kinda confused though, because the noise only happens when the needle is on the vinyl, but its not spinning. As soon as I switch the motor on and the platter starts spinning, the noise stops. In the breaks in the tune (for example, the break in original sin - solar) the noise comes back. It didn't bother me at first but now its annoying. Any idea what it might be? or how I can stop it happening? Any help is appreciated.