MP3 SX Converter offers the possibility to upgrade two-channel content into the 5.1 MP3 surround format. It guarantees playback with a stable localization of singers and solo instruments even off the sweet spot. Additionally, it creates an impressive feeling of envelopment using the ambience sounds already present in the stereo source. MP3 SX Converter can convert existing stereo MP3 files into MP3 surround. Stereo PCM files (e.g. in a .WAV file) are not supported with this version of the software. This version is the first release on CNET Download.com.