Can You Losslessly Increase the Volume of MP3 Files?
 

There are few things as frustrating as listening to your favorite music and suddenly having one or more songs play at a lower volume. Is there an easy way to fix the volume problem without sacrificing quality? Today’s SuperUser Q&A post helps a frustrated reader solve his volume problems.

http://www.howtogeek.com/280739/can-...-of-mp3-files/