Heres a handy script I use to normalize and compress the audio in podcasts downloaded by my Democracy / Miro player.

This is much nicer when im sitting at my desk working and listening, i dont need to fiddle with the volume-knob mid sub-routine when i'm coding, very handy for smoothing out audio in news feeds where they have a loud news banner/jingle/intro sound followed by various voices.

This just runs at cronjob using 'normalize-audio' audio package