To continue the filming question, it looks like we are going with Switcher Studio, two iPods and two DJI Osmo Gimbals. If they are all on the same wifi network the iPods can be automatically panned and zoomed from the iPad and stuff like that - this includes iPods broadcasting to the iPad. No need for cableing all over the place. Switcher Studio is a £30 per month Sub. We shall see.