This technology is learning on the fly and then reflect your style of playing. Play bass and it will not repeat it but adapt to your cords and rhythm. Add solo and you will be accompanied by previous bass line and chords. Then play as you wanted it, it will be continue learning your bass, cords, harmony, solo and embellishments, rhythm and syncopation. It is true accompanist-on-the-fly technology.

See author of technology performance on guitar (to not think only about keyboards) -- http://www.youtube.com/watch?v=8MxdNsr7xns -- and try to understand what you listen in accompaniment from "creatively applying already listened pieces of current song" technology in question. The idea behind Reflexive VirtualBand is to capture on the fly essential elements of the style of a musician and reuse these elements for real-time interaction. In this way the musician can build up a duo or even a trio, playing with virtual representations of her/himself.