I dunno about all this, I own a MX-1, I got it for peanuts, it's mint and it sounds totally awesome. It can do church organ sounds beautifully as well as Wurlitzer style theatre organ sounds ala silent film era, and it can do contemporary sounds, some of which are quite excellent. Over all it sounds rich and warm and very crisp, whenever anyone hears it they are all amazed that its 27 years old. I love it.