Check out the "Plexi Full" focus zone in the interactive demo part. That's pretty close to "cranked" settings and sound I've witnessed in real life with them.
Sadly, they don't seem to want to play some balls-out chords with said setting, but I assume I'll be doing it on my own.
I figured if the Hype knob was going to do anything for ANY amp, then for the Plexi it would add a gain stage and maybe some negative feedback to make it sound more like a modern "modded" one (which is how many people perceive how a stock one sounds like anyway)