[timmorris]

The Duet also has sp/dif and optical outputs if you have an amplifier that has a quality onboard DAC. Prologic II, Meridian Trifield and Lexicon Logic 7 are all proprietary methods of extracting the phase cues inherent in any two channel recording and applying algorithms which attempt to recreate a three dimensional soundstage. The degree of success depends on how the music was originally recorded. Some good quality accoustic recordings using dual coincident mic techniques can sound fantastic when played through "synthetic" multi-channel algorithms. The information is acutally present on the track UNLESS you've compressed it using mp3 or AAC - as soon as you use any perceptual coding algorithm on music one of the first things to go is the phase information of echoes arrving at the mics. If you are playing lossless music (FLAC or Apple losless) then that is a different matter.

Tim