There is actually no "Cue Mix" function inside of Studio One software. In fact, the idea of Cue Mixing only comes from the design of certain interfaces that do not allow the routing of audio through an interface that requires a software controlled audio mix routing. Much like a FireStudio Project or our Studio 192.
It's important to know that creating a "Cue Mix" on a StudioLive mixer would be the equivalent of just using the StudioLive mixer as a normal interface, routing audio through the Auxiliary mixes on the StudioLive XX.4.2 mixer (AI) or on a StudioLive 16.0.2 mixer. Once you have done this, you can then route your analog audio through the HP60 and listen to what is being played in real-time.