The crappy mics on those little video cameras don't record enough bass to balance the sound. There's no way to know what it really sounds like yet. The Yamaha streaming video came off the mixer, and you could hear all the parts.
I expect the sound of the Korg to be excellent. The variations in styles may be another story. We'll see if they have learned any Country since the last generation. They COULD listen to some Ketron styles to get a clue.
DonM