Sound levelling software

i need a software that would make all the soundfiles from a folder play at the same loudness

we play MP3s in the restaurant and i’m tired to death hearing some of the songs blaring out while the patrons are enjoying a romantic dinner :fume: :fume: :fume: :fume: :fume: :fume: :fume:

Works great at all bitrates.

thanks a million crimsoncarriage,life saver!