Tell you what though Alec - it's clearly a subject of considerable interest and complexity...
I wonder if there is all this interest because the sheet music stand is that much higher/further away from the keys and maybe it seems potentially easier to have the data you need in order to read/play/sing a piece of music, on the screen very close to the keys.
Or is it just because new technology is making it possible - thanks for the explanation about NX by the way which means that I'll convert to NX from GM2 in future.
Cheers
Roger M