CueMix doesn't allow me to hear what's plugged into it, only what Logic is outputting that has been previously recorded. No live monitoring.

What version of CueMix are you running? And what version of Logic, and your operating system?

CueMix FX 1.6 48575, Logic Pro 8, OS 10.5.8 The software does talk to the unit but no audio signal is present on each individual fader present on CueMix; except the main output fader has a signal - but I can't turn it up or down. (sorry for the delay in response)