USB headset issue

My system is Leap 15.5 and recently I acquired 2 USB headsets (over-the-ear speakers and boom mic) and as of yet I am unable to figure out how to make either of them work. I did get audio out to them once but the system has yet to see the mic, it doesn't see any sound hardware except that on the mobo. Yes, it was late and no, I don't remember what I was doing to get the sound to the headset. Any clues toward resolving this would be appreciated. Thanks, Fred