Actually latest version is 1.23 
Dolby Digital compatibility. Designed to work with stand alone home movie theater amplifiers (AC3 in/out compatibility)
Full scalability. Aud-X track can be played on any speaker and sound card set-up. You can use stereo speakers (by switching the DirectShow decoder to stereo mode), use your PC 5.1 speakers set, or hook your PC to the home movie theater. If one day you will upgrade your sound system – it will cost just to change the decoder setting to enjoy surround sound,
Mp3 backwards compatibility for older software and hardware. On machines without Aud-X decoder installed, users will still be able to enjoy stereo or mono mp3 sound (depending on the encoded Aud-X quality option),
AVI compatible. This function makes Aud-X perfect companion for Divx/Xvid encoded movies. It must be emphasized that Aud-X works good at 128 kbps (traditional mp3 bitrate for movie encoding),
Avi, Ogg, Matroska, Mpeg containers compatibility,
Complete solution. Aud-X comes with a complete set of tools for movie encoding and playback. We also support users with „How to” guides at www.aud-x.com
Wide range of encoding bitrates. Aud-X can create streams ranging from 80 to 192 kbits. You can choose preferred quality accordingly to your requirements
80 kbps - world record breaking compression bitrate for 5.1 sound. Such a low surround sound bitrate allows for successful multichanel Internet audio streaming,
Easy to use interface. Designed for non experienced PC users not, only multimedia professionals and software freaks,
Web site support. FAQ’s and HOW_TO’s at www.aud-x.com
High sound quality. Tests show that Aud-X outperforms other multichannel encoding technologies at comparable bitrates,
Built-in Pseudo Surround module. You can choose to listen to your old mp3 stereo records with Aud-X DirectShow decoder. Stereo sound will be converted on the fly to 5.1 format with sophisticated algorithm that adds new spatial feeling to your tunes / movies.
Make sure to check out their VirtualDub Surround Edition too
Main Aud-X Features
Dolby Digital compatibility. Designed to work with stand alone home movie theater amplifiers (AC3 in/out compatibility)
Full scalability. Aud-X track can be played on any speaker and sound card set-up. You can use stereo speakers (by switching the DirectShow decoder to stereo mode), use your PC 5.1 speakers set, or hook your PC to the home movie theater. If one day you will upgrade your sound system – it will cost just to change the decoder setting to enjoy surround sound,
Mp3 backwards compatibility for older software and hardware. On machines without Aud-X decoder installed, users will still be able to enjoy stereo or mono mp3 sound (depending on the encoded Aud-X quality option),
AVI compatible. This function makes Aud-X perfect companion for Divx/Xvid encoded movies. It must be emphasized that Aud-X works good at 128 kbps (traditional mp3 bitrate for movie encoding),
Avi, Ogg, Matroska, Mpeg containers compatibility,
Complete solution. Aud-X comes with a complete set of tools for movie encoding and playback. We also support users with „How to” guides at www.aud-x.com
Wide range of encoding bitrates. Aud-X can create streams ranging from 80 to 192 kbits. You can choose preferred quality accordingly to your requirements
80 kbps - world record breaking compression bitrate for 5.1 sound. Such a low surround sound bitrate allows for successful multichanel Internet audio streaming,
Easy to use interface. Designed for non experienced PC users not, only multimedia professionals and software freaks,
Web site support. FAQ’s and HOW_TO’s at www.aud-x.com
High sound quality. Tests show that Aud-X outperforms other multichannel encoding technologies at comparable bitrates,
Built-in Pseudo Surround module. You can choose to listen to your old mp3 stereo records with Aud-X DirectShow decoder. Stereo sound will be converted on the fly to 5.1 format with sophisticated algorithm that adds new spatial feeling to your tunes / movies.
Make sure to check out their VirtualDub Surround Edition too
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