I have an Audiobox 1818VSL. I had been using Protools 10 on my MacBook Pro. Up until about a week ago the OS on my Mac was Mavericks but I have since upgraded to High sierra. I have uninstalled the VSL software (supposedly) and installed the Universal Control. I can no longer hear anything from the headphones on the 1818. The one answer I found on this site is of no help to me because my Audio MIDI Setup does not give me the same options shown in the answer. Any thoughts?