This is true. Many of the GM and Matriarch circuits are based off of vintage Moog Modular, and the oscillators are from the Minimoog Voyager. The Subās are definitely the modern, or contemporary Moog sound. They can get more edgy and cutting, but dialed back they can do smooth as well.
I think Iāve said this before, but I wish Moog would do something like Fenderās Parallel Universe, where they just switch some things up. I would love a Subsequent 37 that has the Matriarch Circuits. Being able to recall, and use that sequencer would be a blast. And why not put the modern Moog sound of the Subās into the GM or Matriarch Format.
And I think it would be cool if they did something like a Matriarch, but without a keyboard, and in that rectangular box style of the Model 10 and Model 15 to sit on a desktop.
Also, and Moog you should be listening here because this idea will sell a ton: Put the Model D circuits into the Sub 37 and Sub 25. After watching other brands clone your wonderful Minimoog, just give us those circuits, and that sound, in a less expensive format. Image the sequencer and modulation of the Sub 37, but with the sound of the Model D. Keep the prices similar to what the Subās are now, and watch the sales roll in.