Mark,
Bring your file into the edit side highlight a small section of JUST THE BACKGROUND NOISE go the EFFECTS > NOISE REDUCTION > NOISE REDUCTION > OK now highlight the whole clip and go to the noise reduction again and preview (it will be open with the last setting used) … You will have to adjust the percentage of reduction, if you take too much out at one time it gets ugly, moocho ugly, I fondly refer to this as the “rain barrel effect” not good Grasshopper … WILLIE