REMEMBER THIS:
You can often lower the level of perfectly steady, pitched noises (such as lamp dimmer buzz or camera whine) dramatically, and in some cases eliminate them entirely.
You usually can’t get rid of random or unpitched noises (such as traffic or preamp noise) without compromising dialog. The best you can do is make them less annoying.
Equalizers, expanders, and delays can also be effective noise reducers. Instructions and examples ...
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