im about to purchase an Onkyo receiver 5.1 channel receiver with speaker and subwoofer. now is the part where im confused about. The receiver has 4 HDMI IN and 1 HDMI OUT as far as i know to get HD sound the device must be connected through the receiver like PS3 HDMI> Onkyo Receiver. but how do i play the ps3 if its connected to receiver? so here im guessing is where the HDMI output comes, so say i connected to my tv via HDMI 1 on my tv and Output on receiver. so do i just always stay on HDMI 1 on my tv and from there select the input on the receiver? do i need an optical audio? what if my tv has ARC? i have a APPLE tv, google tv, xbox, ps3. so do all of them connect to the receiver via HDMI? so when does optical audio comes to place becuase my tv and all my gadgets has one, which one do i choose? will there be a screen on HDMI 1 on my tv that says which input i would like my receiver to output? someone break it down for me please.