I found this great new FREE app called The Levelator
From the site:-
I've just installed it on my Leopard MBP and it runs like a charm and certainly does what it says.
I have no affiliation with this app, I just thought you guys would like to know about it.
From the site:-
So what is The Levelator? It's software that runs on Windows, OS X (universal binary), or Linux (Ubuntu) that adjusts the audio levels within your podcast or other audio file for variations from one speaker to the next, for example. It's not a compressor, normalizer or limiter although it contains all three. It's much more than those tools, and it's much simpler to use. The UI is dirt-simple: Drag-and-drop any WAV or AIFF file onto The Leveler's application window, and a few moments later you'll find a new version which just sounds better....
I've just installed it on my Leopard MBP and it runs like a charm and certainly does what it says.
I have no affiliation with this app, I just thought you guys would like to know about it.