DFX for Winamp - Version 5.0 With DFX enhancement, users of Winamp, MusicMatch, RealPlayer, RealJukebox, Sonique, and J.River are finally able to experience true high fidelity. DFX enhances your music listening experience by improving the sound quality of MP3s and other music files. Renew stereo depth, boost your audio levels and produce a deep, rich bass sound with DFX plug-in.