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For this type of critical noise removal, one is far more likely to get decent results in a program like Adobe Audition. There, one can isolate the noise profile and remove it fairly effectively. It is not easy, nor is it perfect. It takes a lot of listening and adjusting.
The freeware audio editor, Audacity, might have some of those capabilities, but as I have Audition, I have never explored it for that purpose. Hoever, with the proper EQ and gate filters, one might be able to isolate and diminish the bad frequencies, while increasing the amplitude of the required frequencies. Where they overlap, there will be issues.
PS the secret to shooting this sort of material is to use a "blimp," or a "barney" for the camera, or to use a very directional shotgun mic only.
Good one. I assumed that Audacity could help, but have just not used it for that purpose. I did not want to send the OP on a "wild goose" chase.
Thanks for pointing to the tutorial.
I hate to recommend an expensive (albeit very powerful) program, like Audition, even if it is by Adobe. Having a freeware tool available is always nice.