Compressing the crap out of an mp3?, I want to do almost the opposite of RG Options

[sthayashi]

So back story first:
For long drives, I like to listen to podcasts to pass the time while driving, usually This American Life or Radio Lab. Both podcasts usually have multiple interviews within them, but the interviews seem to be usually mixed at an almost random volume. Plus it seems the volume range between too quiet and too loud is really tight when driving. End result is that I'm adjusting the volume all the time, which is frustrating and probably a little dangerous.

What I'd like to be able to do is just put it on, maybe adjust the volume at the beginning and then not worry about it. Just focusing on the driving and listening.

RG was designed to normalize perceived volume between different song tracks while leaving the actual data intact. I'd like to compress the actual volume within a track, and I don't mind if it's destructive. Is there a good free program that can do this for me? Or is my best hope to decompress->use Audacity-> recompress?