I have THE original MK22+ module. It has a Hi/Lo Gain switch and a Tonestack Switch that toggles between the early 70's 4 Input Marshall (less Mids) to the 1979 2 Input JMP Module (more mids). Shoot me a PM to make an offer and I'll take pictures. The plastic adhesive which had the printed words "Bass, Mids, Treble" etc. fell off about a year ago but otherwise, the module is in perfect condition and sounds awesome.