Mac/Device Setup/different input output


I’m using Cubase LE (5.1.1Build 120)) with Mac OS 10.9.1 with a Tascam US-122 MKII interface. I have it all working, basically. However, when I look at the VST Connections, it would seem that I should be able to have different input and output devices - such as the Tascam as my input device and the Mac System audio for my output device. Device Setup seems not to allow me to create more than one audio device (to serve both input and output). The upper left + button offers to add Remote Controls, but not additional audio system entities. Is it possible to achieve the configuration that I have described - one device for input, another for output?

Thanks, Brian