As several have said, if he is staying with the Marshall, he should boost the front end and eq the loop. Add a decimator just before the return to get rid of the noise. IMO boost the mids and the output on the pedal before the input of the amp. Scoop the mids on the amps tone stack. Taylor the eq in the loop to taste. Stand around afterward and talk shit about how much heavier you are than that local band you hate.