Looking for a way to connect several HDMI signals between two devices back and forth, I came across this product. The HDMI Matrix is with me the change of console, PC, receiver etc. between televisions and projectors. The optical output on the A-side provides the ability to loop the incoming audio signal separately to my decoder. Meets wonderful because the projector can output any sound. The Official only. At the output B of the TV is connected, which leads also the incoming audio signals via a Toslink cable to the decoder. So the sound always comes to the sound system. Prerequisite for this configuration, two optical inputs on the decoder, of course. For the comfort and exchange between the devices I can recommend a Multifunktionsfernbedinung warmly. For easier use of the matrix reaches the supplied fully. For gröhnenden conclusion: The LEDs of the matrix are not annoying! Someone once thought along and not incorporated blue laser death * cheer *.