maybe they have used the melodyne for resolve the all chords tab.. http://celemony.datarepository.de/video/exp_tour/Melodyne.2.6.wmv
Give also the VST version in realtime for each tracks SEQ: http://www.lionstracs.com/store/images/gui2007/os2/melodyne.jpg

Like Diki told before; I cant really understand too how the Audya can manage the all audio chords loops in realtime...

In the video demo I saw just some chords pressed, but what happen if the all others chords are pressed?
Audya can not HD streaming, for sure they have first to load the all data in RAM and then manage all by the Midi, like a sampler.
They have cutted the video from the first style to the second, so I can not understand how much loading time they need before one style is ready to play ( SD1 need a lot of time just for loading some Mb of data...Audya use the same Dream chipset..)
maybe, how Tommy told before, they will use the same loops for tons of others styles, because they have to hold in memory...how know?

After this, I like to see how they can switch chords in offset of the BAR quantize and hear if the audio loop can start is offset point too. ( with HD streaming is possible, but under MIDI sampler controlled this is impossible)

maybe someone can reply to my question, because i'm really courios to understand.
cheers