presonus audiobox itwo

Hi everyone,Not a QLab user, have a bit of a weird issue going on, would love any ideas/feedback.I have a PreSonus Audiobox iTwo that I am trying to set up as an audio out for QLab (v 2.3.9). It is attached from a USB out on the Mac (OSX 10.5.8 / 2 GHz PowerPC G5 / 2 GB DDR SDRAM) to the USB...