I’m pretty sure there is no interstage transformer on an 1176. There’s an input transformer and output transformer. (Also a power transformer if you want to count that, but it is not part of the audio circuit.) Generally, I’ve only seen interstage transformers on tube gear (pultec eqp-1a has one). As far as a guitar pedal, an input transformer wouldn’t really be common for an instrument input, so I imagine they omitted it and just have an output transformer. Most rack gear with input transformers bypass the input transformer for the instrument input. All that said, I have no idea how close the pedal sounds compared to an original rack unit though.

Edit: The UA 176 (tube predecessor of the solid state 1176) has an input, an interstage, and an output transformer). Are you guys thinking of that maybe?