ok my question is about the av (in) in the front of the dvr box. do these work? and if so how would i use them? my tv is older and only has 1 av port (1 set of white red and yellow IN) was trying to hook an xbox up to the tv at the same time without buying extra equiptment plugged it in te front of dvr box and couldn't figure out how to use it. any help would be greatly appreciated thanks.