Mesa Dual Rectifier Sim/Mark Sim

[KerryF]

Hey.  I heard that there is an amp simulation for both the Mesa/Boogie Dual Rectifier and the Mesa/Boogie Mark amps.  Where are the layouts (preferably veroboard/stripboard) for either one.  Can someone also explain a little about what each sound like.  I know the Dual Rectifier is very hi-gain and dark, but what does the Mark sim sound like?