I cannot believe that some of you guys need so many options to work with. I remember having a full digital rack of gear, my VH4, and playing in a commercial cover band, I needed a lot of variety. In the end, I only used 3-4 different variations on the basic sound as the audience will not be able to pickup on all the dozens of nuances you would like to be able to play as if you are in a studio. The live situation boils down to being able to perform well and make the audience entertained. I realize that you want to play your best so you want all the possibilities that can go into an amp, but there will always be trade-offs.
I finally ditched the rack and got a simpler pedal board that gives me what I want fast and forgot about all the midi bullshit. I used only 3 of the 4 channels on the VH4 most of the time and my Herbert sounds fine without any midi, and life is simpler on stage now.
What you need is a Tele sound, Strat sound, LP sound and maybe a 335 type tone and you have most bases covered. Variations on these can be done using guitar knobs, and an EQ in line.
Adding a midi -/+ feature to an already feature-laden amp, or making the entire amp midi selectable with 128 different settings is a waste of time.
Besides, there are other midi toys to help you get that stuff done. Keep the amp pure and simple for the best tone it can offer you.
The best sounding Marshall imho is still the SLP without all the superfalous bullshit the newer models have. These Diezels are fine just as they are. Peter knows what sounds the best and what will save the customer money without sacrificing tone and quality.
Learn to deal with the amp as is and think more about playing then tweaking dials and switches. Believe me, your audience doesn't give a shit.