I have recently had Virgin installed after years with Sky. My TV is a four year old Humax with DVI connection not HDMI;I got an adaptor and connected fine-but it is sound only.I have since investigated a CYL converter box in which you put the optical digital lead from the Virgin V+ HD Box and take phone leads out into an external amplifier,Before I get one of these;the engineers left my V box ob SD Scart connection-how do I change back to HD connection-and can you "swap" between the two-as I want to play/record stuff on my DVD recorder