As this thread was about the Audya (not knocking the Yamaha in any way) I just want to say this by way of summary;
The Audya is not about any one aspect, its not just the massively long drum loops recorded by specialist percussionists, the very cool and unpredicatble bass player that changes riffs on each chord variation, the live acoustic, classical and electric guitars or even the natural sound of the lead and pad voices, its all of those elements combining together to make you feel that you are playing with live musicians.
Its that unique experience that gives owners of Audya's the lift that only can be found when you play with other human beings...and that is something that cannot be demonstrated by any ammount of demos, sound bites, questions or discussions.
And only those of us that have played with live musicians can know what I am talking about.