MJMP,
The only place the Cyber Deluxe outputs dual mono signals is at the two recording line outs. The expander out is only supposed to have the right channel of the stereo effects when you select that function.
If there is no stereo effect selected when connected with an auxiliary amplifier, then the right side comes out dry with any reverb you might have dialed in. This is actually kind of cool when you are using just the CD without the Cyber Twin in the middle. You get your mono effect out of one side, but you still have your core guitar tone coming from the other side untouched, so it's parallel effects when not using stereo. That will make mic'ing these up a lot easier when recording.
The manual doesn't give much detail about anything these amps can do, so you have to figure all the really cool things you can do with these amps as you go. For what they are as far as modeling amps go, and as good as they sound, I think I made the smart move buying these while they are still cheap. Overall, I could take either the CT, or the CD's, or both rigs to any gig and can keep up with the best of them.
BTW, I just got the bugs sorted out in my desktop and in Cubase, and managed to finally get it to record some guitar direct. It took me almost all day to figure out what was wrong, but something in my Focusrite got screwy and I had to remove the software and reinstall it to get the inputs working again. Fortunately, I'm only involving three different types of software, Cubase, Toontracks, and Focusrite. I don't have any plug-ins or any of that other stuff, so all my tones have to come from my amps and effects.
Anyway, after I get a couple of decent sounding programs set up in the amps, I'm going to get a few sample tracks recorded and post them here. I just hope I don't run into any software glitches again.