I currently have HDMI cable from tv to 3x1 hdmi switch box with audio output. I connected an HDMI from Roku to HDMI switch box HDMI 1 port and HDMI cable from DVD player to HDMI 2 port. Have sound bar connected using rca jack plugs on switch box. I get sound playing Roku on Netflix only not on Amazon prime also no sound from DVD player. What do I need to do? Help!