Well...I think you have missing this double audio-midi players features from the year 2003, 5 years now that we have this feature.
We shown the first time the MS at the NAMM 2003 with Delmar Brown: http://www.lionstracs.com/demo/video/delmar2.WMV

Of course NOT only double Audio-midi, but also the Video: http://www.youtube.com/watch?v=foOMEXvvZnI&eurl

Maybe in 10-15 years the others brands are able to offer this features too....who know?