Thanks for the replies. I am more than aware of the Stu Hamm scenario, but there is an active element going on there which I am hoping to avoid. I am just trying to see if it is possible to do it passively and not run into buffering etc issues if all the pickups are on at the same time. My guess is probably not, but unless you ask you do not know. It might well be that all 3 pickups at the same time would be too much of a good thing.