Available packages to normalize analogue audio?

Loving OSMC on my new RP2. Thanks to the team for their great work.

I’m using the analogue (3.5 jack) output for both my music and videos. What I find is the music tends to be very loud, television medium and movies very quiet. I understand this isn’t the fault of OSMC/Kodi but just the nature of different media having different sources and characteristics. I’ve tried my best to normalize things by using a low PreAmp level for music and the boost center channel option for videos. It helps but it’s not perfect. I especially dislike this for the music since the lower the preamp, the more hissing can be heard.

Since OSMC has a lot of Debian packages available, is there something I could install that could help normalize the audio more? Something agnostic to the source of the media like this tool for Windows?