This Pedal is currently available.
Plexi Overdrive
A well-known secret to great tone out of the vintage, 4 input Marshall™ amps is to use a patch cable to connect two of the inputs together. When this is done, the HIGH TREBLE and the NORMAL volumes are both active and can be blended together for the perfect crunchy combination.
That is what Marvel Drive recreates. Just like the amp, Marvel Drive uses two gain stages in parallel, one with a bright and throaty scream, and one with enough thump to rattle the walls.