None of the scan converters and such offer surround sound output. Aver is purposely misleading you. The surround that it outputs is the origonal sound with added freaquency equilization. From the stereo effect, a sound chip figures out which direction the sound is coming from. Then it adjusts the sound such that it has the tonal effects of a sound coming from that direction and heard by human ears.
This gimmick is still two channel sound, although it occaissionally improves the sound on inexpensive speakers.