The Scholz Rockman X-100 preset is a simulation of the "cab" section from its schematic. I exported the frequency response to a CSV file, imported that into Impulse Control, and exported the WAV IR. Then, starting from a blank preset, I imported the IR and traced it for the Editable Curve.
One thing worth knowing: the Rockman's "cab" circuit doesn't need much LF (low-frequency) roll-off because its pre-EQ already handles that pretty aggressively. If you're pairing this with a more traditional pre-EQ/gain section, you'll probably want to enable the optional low-cut filter (in EQ Curves).
A fun detail: the Rockman's pre-EQ has a mid boost right where the cab filter has a mid cut, so you end up with a kind of pseudo-complementary pre/post EQ relationship. That's actually a big part of the signature Rockman sound. Whether it was intentional or just happy accident, I find it pretty fascinating either way.
https://impulse-control.app/?browsePreset=4426ef89-0776-4e51-89c6-f8ec293fab29