Noise goes away when off the gas. Coming from trans I'm assuming.

I don't know if I just haven't noticed it before or if this is a new noise. Does anyone else have this?

 

The noise is constant and always happens when you depress the gas pedal at 30mph? At what mph do you stop hearing the sound if you speed up? Does it always happen in the same gear? Does anything make it louder or quieter like turning, clutching, or using the a/c?
The more descriptive you are the more help we can give you