1)   SRS Audio Sandbox 1.00
The SRS Audio Sandbox is the ultimate audio enhancement software for the PC. It delivers amazing surround sound, deep bass, and clarity, even on desktop speakers. Works with all music, video, and games on the PC and has special custom presets.

 2)   Advanced MP3 catalist 1.2
Advanced MP3 catalist is a easy-to-use utility to organize and play MP3 files with search, player and more

 3)   GogoL! 1.50
Audio enhancement plugin for the most popular media players like Winamp, Sonique. GogoL! is designed to enhance the listening experience for users of Internet audio formats such as MP3, and Microsoft's Windows Media streaming format.

 4)   ZVolume Pro 3.44
ZVolume Pro is a poweful nice replacement of the standard Windows volume control. It can be vastly customized, including change its look by skins.