Alright, Ive had Sl4 for ages now and one thing i havent really looked into in any depth is the dual usb ports which apparently allow "Seamless changeover and b2b performances", seamless doesnt quite seem like the word lol, been having some trouble. Seems a lot of messing is required to do it. Is there any way to just have serato open on one laptop, then you kind of "give" one of the decks to your partner, then give the other when when your second tune has been taken out by them? Only way ive found how to do it (through trial and error) requires a lot of messing about and frequently results in tunes cutting out or channels being changed and stuff. All very confusing and when you mix lean 90% of the time it results in even more confusion. Basically i want to go b2b with a pal with 2 laptops being used and have a reliable way of us changing over.