I would certainly appreciate some help with this. Is there such a thing as a switch that could be used with either an optical or digital audio cable? What I would like to do if possible, is to run an audio out cable(optical or digital) from my cable converter box to a switch, and then run 2 cables from the switch to my TV and my receiver. In this way I can simply use the TV speakers for most SD TV programming, but then switch to receiver and stereo speakers for HD brodcasts in 5.1 surround. Does such a switch exist? Thanks in advance