for an art installation i was trying to syncronize sound and slide changing which is supposed to work if you put a 1000 Hz sign on the audio tape in the projector. there is a button for sync and 1000 Hz but i tried out in all possible ways and did not manage to make it change by itself. maybe the function 1000 Hz is broken. But i wanted to check in the manual if it is maybe just a fault of employing... Thank you ****