Notes from Bill Allin
Though many freeware programs will play MP3s and other audio formats, only Passion Audio Player gives me chills of excitement when I listen to favourite tunes on my computer. In addition to the commonly included features of pitch, tempo and samplerate variations, playlist assembly, shuffle, streaming audio and so on, it has a preamp (with ON/OFF switch) and ten equalizer slides that cover an unusually wide range (which adds richness to the sound) and may be set on Auto. With so many features it includes and formats it accommodates (through BASS API 2.2), it's best to direct you to the web site.

NOTE: The latest version is 2.3, but some freeware sites still have the older v2.2 if you search for download sites. Version 2.3 is so complete that the author doesn't even have a plan for what else he could add in a future version. I can understand why.