IRock
 
Check out the X3 Users Reference Guide Pg. 1029 Tolerance "simulates the component tolerances of the bus circuits". It sounds like this adds some variantion to how the each console sounds in the tracks/buses.

ok. that seems to make sense. and it's stored with the project, so whatever is random is only random initially.

Two tips:
 
1. Remember "quick grouping" when you want to add or change modules, or change console emulator settings.
2. I did some audio geekery of my own, and found that the CEs also emulate some of the characteristics of audio transformers. In the graphs referenced earlier, you can see the increased distortion at the lower frequencies for the A- and S-types that's characteristic of some transformers.
 

+1 on what Ben said - Redd console for that Pink Floyd influence. And do it BEFORE I buy Wave's REDD please! :)

I just did a country mix and used the S type.  My bass was full and slightly modulated so I thought the S would keep the mix bright.  I then used some tape emulator on the master, then spread it slightly with the BT spatial.  Nice.   I like many of the new vsts in X3.  For a clean, tight country mix, I may try it but I don't know if I would notice a difference between consoles?

I tried the console emulator a few times and found that after playing with it, trying different settings, and even doing a couple of full mixes with it, that in most cases I preferred it off.  I've found it to be better used as more of a saturation type of plugin on certain sounds here and there similar to the Softube Sat Knob.