Hi,
Classic routing is not really recommended and it has nothing to do with this case. As to the manual it is still there because of backwards compatibility.
Fuse/Export, DirectSound device and 1394 from the Output Mapping are not of interest in that case. Post a screen shot of your current output mapping settings, section Chrome XE output. Make sure you added a second Stereo bus from the bus type section. Your tracks 3 and 4 must be routed to that second stereo bus; your tracks 1 and 2 must stay with the normal stereo bus as they do by default.