HD audio function?

Upon connecting a bluetooth speaker, got no sound, further exploration of settings next to device in BT list, I found HD audio enabled. Disabled it, got sound.

So where or when does HD audio come into play, if not when using bt speakers?

Running A12 on FP4.

It’s a known bug with A12. You will find further information in the corresponding thread:

Best is to post there if you still have any questions left.