If you set your playback device as the UA5 and your recording software supports monitoring, the UA5 will work in duplex sending a signal to the computer and back to the UA5's digi outs. This should also work in "adv" mode (which just means 24bit, not 24/96 as someone else stated), but only in 44.1 & 48k. The UA5 will not work in duplex in 24/96.
You don't need the mod for them both to work simulaneously.