You're not supposed to be able to tell whether CE is turned on or off on a single channel just by listening to a single channel.
You're certainly not expected to hit it hot and declare that it's overdrive sound is terrible. Of course it is, have you ever heard an input channel of a Neve or Otari or Soundcraft or Yamaha desk that's been pushed to overdrive by a way to hot signal? It is bad, I assure you.
Mixing desk channels, inputs or busses, are not FX units. The aim of any mixer is to be as transparent to the audio as possible and the only colour added should be through deliberate use of the EQ section.
The reality of old and modern electronics means that a perfectly transparent mixer is not possible. The more you spend on circuit design and high quality components the closer you'll get, but it'll never be perfect. The mixer will always impart some colouration to the audio. Differences in circuit design by different manufactures will give different colour to the sound, hence a Neve sounds different to a Yamaha which sounds different to a $50 Radioshack DJ mixer.
Which you think sounds
better is purely subjective and everyone will have their own oppinion. The differences in sound between most high end mixers is so small as to be insignificant in most cases because the rest of the equipment has much more effect. The size and type of studio monitors, their possition relative to the mixer, your possition relative to them, the volume you have them set at, the way they're mounted.... each of those alone has more effect on the audio than the "sound" of the mixer. Add them all together and the mixer is almost irrelevant.
To compare two mixers in a studio setting you'd need to use one for several days to learn its "sound" with different instrument sources, maybe do some recording and mixing to see how it balances different frequencies and how they interact with each other in the busses. THEN you'd rip it out and replace it with another mixer, using all the same outboard equipment and cables, making sure everything is exactly as before. Then spend another few days doing the same routine of learning the sound of the mixer...
At the end of it you'd either swear that "A" was way better than "B" (because you tried to match the sound of "A" and couldn't) or after 3 days trying to make "B" sound like what you thought you remembered "A" sounding like, you finally admit that you've forgotten... (because you can't actually tell a difference)
Either way, in Sonar it appears to be easy to make comparisons. You just change the emulation setting don't you? Well, no.
First, you have to use the CE on EVERY channel and bus. Then you need to do a mix
from scratch with each of the emulation settings and also a mix with no CE at all. The CE will alter the frequency responce and harmonic content of the channel/bus, thus you have to start from scratch with your EQ at the very least.
Finaly, when you have been through the entire process for each emulation (incuding
none) and you have a set of 2 track masters, you can do a blind listening test to see which one you think sounds better. This then assumes that any differences you hear are actually due to the CE and not simply because you mixed the same track 4 times and got better at it each time....
OMG look at that post.... I'm turning into Danni