So now we're back to the original state. Next we'll try manual noise reduction, which is a two-step process. The first step is to tell Audition what the noise is. Zoom into a small region in the file ...

I ran multiple test cases in Audition and RX3. The primary difference was that RX3 did a noticeably better job removing noise from speech. That is, when the background noise was the only noise present ...