Good answer, Erisian. I was just about to post about Noise Removal.
2-ton,
At Audacity, Noise Removal
http://manual.audacityteam.org/man/Noise_Removal

Another take,
http://www.makeuseof.com/tag/remove-amb ... -audacity/

ed.,
I would suggest you zoom in and use it selectively.

AWK, looks to hard to me, not even sure what they are talking about...but nothing ventured, nothing gained!

*well, tried it out...I need lots of practice, but I at least managed to do a crappy job, but a job nevertheless, lol.

The good news is Audacity now has an Isolate function.



Select an area where there is only the audio you want to keep then open Effects/Noise Removal and click on "Get noise profile." Then choose Edit/select/all and reopen Noise removal and click on Isolate.
You'll probably need to play with the sliders to get it right but that's basically how it works.

And yes that screen helped me figure it out a bit. I would have liked to just remove the voice and not all the background, but that isn't going to happen with mono! Still, it worked ok for now. Some of the other effects look cool but didn't have time to try them out. Now all I have to do is try and replace the original video sound track with this new one!!!!

Good to know it's going OK.

Avidemux can do it.
http://avidemux.sourceforge.net/

first I think I'll try to see if I can do it with iMovie. Theoretically I should be able to mute the original sound and then add the changed file from audacity. Since it's the same thing, basically, it should fit perfectly. Oy I hope it isn't going to be like the old dubbed movies where the lips are slightly out of synch with the audio, haha.