Just ordered some new AKG K845 BT headphones. Haven't got them yet. My Mac Mini is a headless music server, connected full time to a USB DAC. I'd like to pair the BT headphones to the Mini for occasional late night listening, without having to switch audio outputs in System Prefs. I've googled this and can't find a definitive answer. Will the headphones pass music without being set as the output? If not, will setting up an aggregate sound device allow me to use both USB and BT audio out simultaneously? Or are these headphones going back? Thanks.