these settings should help get a nice chunky sound.
i would suggest on the marshall:
bass: 8-10
mid: 2-4
high: 6-8
on the metal zone i would suggest this:
bass eq: 7-10 (there are no numbers, but guesstimate)
mid eq: 4-6
mid freq: 3-5
high eq: 7-8
put distortion at 5 or maybe up to 8. getting the gain/distortion past that makes it sound bad.
Thanks for listening to this small piece of me.