What use to do light-duty AUDIO Editing (MP3)

Hi all - I have an MP3 (audio, recording of a speech) that I just want to reduce background noise and increase it's volume a bit.
Any suggestions for software (Mac or Windows) to do that?
(We use iMovie for "Video/MP4" editing, and I do see a right-click "Extract Audio",but still can;t figure out how to isolate the Audio & Save it as an MP3)
Who is Participating?
Paul SauvéRetiredCommented:
audacity.sourceforge.net runs on both mac and windows
Dave BaldwinFixer of ProblemsCommented:
Second for Audacity http://audacity.sourceforge.net/ .  They have a new version out today.  Also, MP3s must be decoded before they can be edited.  Audacity can decode them itself but need the LAME plugin to save files as MP3s.  Both are free and available from the Audacity web site.
Ali EslamifarUXCommented:
I would absolutely recommend these:

1- Audacity: http://audacity.sourceforge.net/
2- Power Sound Editor: http://www.free-sound-editor.com/
3- Wavosaur: http://www.wavosaur.com/
4- Traverso DAW: http://www.traverso-daw.org/
5- Ardour: http://ardour.org/
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Not really answering for points or anything,
i just want to confirm Paul Sauvé's suggestion of Audacity.  

For free, audio editing doesn't get any better.
Just like tailordigital said, this isn't for points either.

I still use an older version (2.0.x) because i have been perfectly happy with what it does, but have never really had great results with background noise reduction.  I see that the latest stable version 2.1.0 promises:
"Much improved Noise Reduction effect replaces Noise Removal. Thanks to new contributor Paul Licameli".

The steps explained:

It would seem that you don't get "MP3" as an export format on a Mac, so the steps for extracting the audio from a video using iMovie is a two step process:

1. Import the video into iMovie
Share menu > Export using Quicktime > Sound to AIFF > Options button > choose settings and make them the best quality.
2. Import the AIFF file into iTunes
Convert to MP3.

If you don't use or like iTunes, there are loads of other audio file format converters available and we could suggest some.
I believe that iMovie can also extract audio directly to WAV file format.  That should load directly into Audacity without prior conversion, and after editing you can then export to a new MP3 and choose the "quality" in so doing.
Thank you bleggee
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