Have a look at this video http://www.youtube.com/watch?v=shZt8CgVGxw&feature=youtu.be (http://www.youtube.com/watch?v=shZt8CgVGxw&feature=youtu.be) showing a tablet pc being used to turn pages of PDF music which uses a large TV to display the music.
Well, to be fair it's not quite automatic - it requires the user to wear a headset and vocalise a command when they want to turn pages. I was expecting some fancy software that reads the music as you play and works out when you have reached the pageturn and turns automatically - though I suppose it might be confused depending on how many wrong notes you play!
Here is another Youtube clip somewhere of someone playing using a tablet that's controlled by a toe-piston:
http://www.youtube.com/watch?v=1t7Azfddavk
For another take on the same problem see this console, which displays two pages at once and has thumb pistons either side of the music desk plus two toe pistons for page advance and page back:
http://forum.hauptwerk.com/viewtopic.php?f=21&t=10878
I guess what you really need is a laser beam or something that you can intersect by waving your hand briefly, connected to a tablet or monitor.
I've NEVER used my hands and feet to turn pages. I find that a sharp jab with an elbow is just about enough for the assistant to stop day-dreaming and pay attention. 8)
MM