I am new to Mac and have never had an issue with my Toneport UX2 on my PC, however now on mac running OSX 10.9 Mavericks I load up gearbox etc.. and the needles move showing I have sound but I cannot get any sound, headphones, mac speakers, etc... What am I doing wrong? Is gearbox not able to work with OSX 10.9? I would hate to have to buy a new firewire interface.