The Micro- and MultiMgs were made with different filter circuits. The MiniMg used matched transistors and resistors, much like an audiophile stereo, while the Multi and Micro used integrated circuits. They also had a very different circuit board design, and according to the Mg Music boards, also ran on higher currents, and thus were a little quieter. But the culmination of all this was a deeper, beefier sound on the Mini, and a slightly thinner sound on the other two, and thus you had to use some HP filter to get the same character on the Origin.
And this is yet another testament to how good the Arturia software is. People rag on it as inferior to other products, but every time I hear an A/B comparison like this, I have to think people are just showing their bias, because the difference is practically nothing. And use it in a piece of music, don't tell anyone, and they don't know what they're listening to.
I will admit that if you can get an analog synth, you really should, because there is a certain something that does contribute to a mix. I should mention that some things are still very hard or impossible to do right on a digital instrument yet, like audio rate modulations and analog distortion or tube sound. Next year, I do intend to get a couple of pieces myself. But with the Origin on hand, I'm not in any rush. It handily replaces tens of thousands of dollars of vintage instruments - literally. A CS-80 in good condition on ebay is going for as much as a Mg Modular, TEN THOUSAND DOLLARS or more! Having this sound quality for less than $2500 US, never mind being able to create
instruments, isn't just a bargain, it's like a gift from God.