Hi guys. I just bought an LG OLED B7 TV and I have my Mac Mini (Late 2012) hooked up to it. For 5.1 surround sound I have a Pioneer VSX 1131. I have my Mac Mini connected with HDMI to the TV, and the TV connects with an optical cable to my Pioneer receiver. This very same setup lets me get surround sound on my PS4, but I can't figure out how to get it to work on my Mac Mini (and my Nintendo Switch for that matter). I can only get sound from my 2 front speakers. Any tips?