Amplify MP3 files on your phone quickly and easily. So you already set the volume to maximum, bought those cool headphones, but volume on your music or ringtone is still not loud enough.. The solution might be as easy as amplifying those MP3s in question. This simple application does just that, in 3 easy steps- 1. Start it up, select the files that are not loud enough 2. Set the amplification factor 3. Amplify.