Set gain to 94db for all mp3s in current dir:
-r song gain
-k automatically lower Track/Album gain to not clip audio
-d 5 94db (default is 89)

find . -name "*mp3" -exec mp3gain -r -k -d 5 {} \; 

more info:

Sign up for free and join this conversation.
Sign Up
If you already have a Qiita account log in.