Cubasis can be used as both input and output. The usual way to achieve this is in AB is to load it in both slots before you activate the App. You can then put something like Live Effects in between and apply it to Cubasis output. Unlike Auria however there is nothing on the channel strip that would let you route the audio directly from a channel. (Though I didn't think to look at the mixer..?)
Still being apple to record Cubasis instruments through AB effects in real time is a step forward.