OKKK, so here is my dilemma. I have an old Denson AVR 1912 that takes in HDMI audio and sends it to my 5.1 surround system. Now I have a LG TV, the 5.1 surround system, and a chromecast. Is there any way for me to plug my Chromecast into my TV, then output the audio through optical to a DEVICE then have that audio signal transfer into speaker wire stuff to my 5.1 system. I capitalized device as I am unsure it such a device exists. If it does it will solve all of my problems. Thanks