I own an old Visio flat screen tv. The only audio output option is Optical using a toslink cable according to the manual. I am told there is a $10-15 Converter available online that would convert the audio to analog RCA stereo component output. Worried about any sound lag if I do this. I just bought a Roku Ultra. It only has HDMI to the TV. Want to send Roku sound to my old Sherwood stereo receiver. It has the old fashion RCA inputs. What do I do ? BTW bought Ultra for the Ethernet connection. Wireless is not reliable in my house. Otherwise would have bought Walmart Roku Express +. Am I stuck with tv only sound?