Trying to replicate that Oberheim sound....

Hey r/synthesizers, I've been messing around on my microKORG XL, and I've been trying to create some programs that emulate that particularly thick, biting, crisp sound of an Oberheim synth. Specifically, I'm going for a Rush-esque sound; such as the pads in Subdivisions, or that rezzy growl in Tom Sawyer. I've gotten close, but I'm still not satisfied with what I'm creating.

Any recommendations as to what I should try? I'm mostly having trouble with the filters; everything I try sounds too much like warm analog, and I want to get that aggressive nuance of an Oberheim. Thanks!