The Rig Outputs are just that, the whole rig. Analog is what's coming out of the Main Outs. Are you using the Eleven Rack standalone or with a DAW? If you use it with a DAW you will instantly hear the difference.
- Mirror Analog
The same signal that is being sent
to the Main Outputs will be sent to the digital
outs.
- Rig Outputs
The left and right Rig outputs are
sent to the left and right digital outputs respectively.
Page 91 of the user manual if you want to read further
http://akmedia.digidesign.com/suppor...v90x_71670.pdf