I have an older Panasonic TC P50ST30 (release review/specs here) that was generously given to be by another Arsian that does have ARC support (I think). The TV sitting in front of an old but nicer ...

I need to get audio from my PC to my ancient Pioneer HT reciever, currently it runs on analog in for all 6 channels. Since it is old it only supports DD and DTS, and on top of this I have a 4k@60Hz ...

Among other features, your soundbar may have additional HDMI ports, apart from the one to connect to your TV. Here's what you can use them for.