Most of the demos I've seen are performed by highly professional and very skilled players, and I'm confident the output of the keyboard is going directly into the camera's audio line input. Nothing wrong with that - no different than going into any sound system. So what's your beef? Nothing hoaky about the demos. Now, I only wish I could play as good as Michael Vonken and most of the other players that provide the demos - those folks are fantastic players, and obviously, they really know the ins and outs of the keyboards they play.

Cheers,

Gary