Just got done with a long back and forth with TC Electronics support and found something VERY interesting. When I first hooked up the TC I noticed that I was VERY underwhelmed with the lushness of the chorus, flange, reverb, and other effects. I use it in the loop of several amps, but namely a Mark IV. Just for fun I hooked it up in stereo. Everything sounded way better. I noticed that the chorus effect seems to have two distinct choruses...left side and right side. So, I go back to mono (using the Left-mono output as it is clearly labelled), and again the chorus is single again...no stereo summing to the mono output. I check other effects such as delays and verbs...same deal...the stereo signal is not summed when using the L (mono) output. I've had a lot of rack mount effects, and I've never seen this behavior so I'm figuring something is wrong with my unit so I contact TC support. We go back and forth on several emails. It turns out, ladies and gents, that TC simply does NOT sum the stereo signal when only the mono output it used. That means you get half the chorus, half the flange, half the reverb, etc. if you are running in mono. TC's explanation was that it "wasn't better to do it that way" and that "it would only effect the small amount of users running single amp rigs". SMALL AMOUNT OF USERS RUNNING SINGLE AMP RIGS? So, if any of you bought a G Major and were underwhelmed with why the chorus and so many other effects were so underwhelming...there ya go. They don't sum the mono output. That said...a Y-cable does fix the issue...but WHY should you have to resort to that? Even my ART Multiverb from 1988 summed the stereo image when using the mono output.