Even tho it has 6 channels, those channels only have 2 frequency domains. Unlike the big cage ADC organs that could have multiple FG (frequency generator) boards. That's one of the ways the big ADCs could sound rather better than the little MADC organs. I'll never forget hearing Dr. Eileen Gunther give a concert on an ADC-6000 IIRC. Wow. Seemed very pipe like at the time - of course I was just a kid back then.
I'm currently using my Lexicon MPX-1 to pitch shift one of the channels by a few cents, this definitely gives a richer sense of ensemble in full registrations. Unfortunately that particular device, tho good at reverb, has an annoying bug in the pitch shift routine that makes it sometimes glitch on note changes. This sounds very "digital" and essentially nullifies any increase in realism! If I really wanted to pour more money and time into my Allen setup, I'd find a used piece of studio gear that could do a better job, but I'll probably never got around to that. There's a lot of cheap outboard gear on ebay now that more and more studios are doing their mixing virtually.
NB that getting a modicum of realism from this series of organs, though they were good for their day and price point, is going to be frustrating compared to just, say, using Hauptwerk or something like it. Which I will when Hauptwerk, or something, like it is released for Linux. I simply refuse to run it on Windows. For all we know, every version of Vista & XP in the universe has a built-in time bomb set to stop it working in 5 years. There would nothing illegal with Microsoft doing that. Open source is the way to go, thats why the developers of the Trinity Wall St. organ used it!