Apple Logic Pro /LogicExpress Discussion

Hi.Also. Not sure about this but signal via a bus object can enter an aux as pre or post 
fader.Just a thought. Or is there a way of doing that by simply using an aux? If so I'd be 
happy to hear it. Now I'm starting to get a bit more excited about the whole thing. Cool. So 
how would I have that flexability? By using only aux objects? T