Researched and read reviews for portable dac.amps. Decided on either Burson Air or Chord Mojo. Could not find any dealers in my area Houston Tx. Auditioned a Chord Mojo in Dallas and liked it but decided to try the Air from reviews I read online. I am very happy with sound from phone output (USB Audio Player PRO bit perfect mode) but cannot get it to work with any of my 3 computers. Any help in getting it to work with my computers would be much appreciated. The Yulong is recognized by all my computers and words great. Thanks