I have just encountered a noisy buzzing/humming on the tape for a scene i am working on, i apply the noise removal tool and it gets rid of nearly all the annoying noise but-

The audio spoken by the actors is metallic and digital sounding

and where voices are raised along with other noise the buzz/humming fluctuates with it and gets louder, meaning that the noise re-appears and it all sounds very messy.

Any ideas? am using stp from fcs2

thanks.