Re: Marshall in a pedal?
I'd spend some more time setting up that Trem-o-verb...
Love those amps.
With EL34's and some time to grok it you'll be able to cop a reasonable Marshall tone. The channel cloning is the key...what was it, "red to vintage"..."dirt to orange" or something like that?
Basically you're copping the clean channels tones on the dirt channel, use the vintage voicing option, tube rectifier on spongy, NOT bold!
That should get you kinda in the ballpark.