UR28M Input Monitoring using guitar Amp Sim effect

How do I route my guitar through the UR28M and Cubase 6.5, use the Amp Sim plugin and come back out of Cubase to the UR28M so I can here through the headphones the effected guitar? I can’t seem to get any direct monitoring routed to the stereo outs. All I hear is Mix 1 which is effected by the UR28M’s internal effects but no other active Cubase effects. If I record a track and then play it back, I then get the channels to route through the stereo bus but not when live tracking. Thanks