How do I permanantly apply audio noise reduction in FCP X

I have a clip shot on a blue screen set that had some noise in the background (constant hum from air conditioner). The Background Noise Reduction in FCP X, applied at 100%, does a truly amazing job. But there is one huge problem. It appears that FCP X "learns" as the clip is played, perhaps taking it's own noise print of the background noise, and applying it on the fly. Because for every clip I apply 100% background noise reduction to, that clip begins playing and you hear the full audio with noise. After a few seconds the backgroun noise begins to fade away. After playing for about 5 seconds, the background noise is completely gone. And it's freaking amazing. Better than what I've ever been able to accomplish with Soundsoap or other programs. But the fact that it must do this on the fly each time means it is unusable to me. I can't have each clip in my timeline start with noise, then have the noise drop out after a few seconds. Is this a bug? Am I doing this wrong? There are really no settings. You either have Background Noise Reduction on or off and set your percentages.
I am fixing audio on a 1 hour program. Really need this to work. Anyone else having the same problem, or found a solution? Or know what I might be doing wrong?
Paul

Paul Kakert wrote:
The Background Noise Reduction in FCP X, applied at 100%, does a truly amazing job.
Does this mean you actually like the audio to sound as though it was recorded under water? I guess it depends on the amount of noise that requires removing, but I've never been able to tolerate more than about 40% before the audio gets horribly distorted.
I really don't share your experience of FCP X removing background noise 'on the fly' (sorry).
Andy

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