I think the first minute or so of the song "Back in Black" by AC/DC sums up Mutt's "larger than life" concept perfectly. If that doesn't sound good on a P.A./monitoring system, forget it.
The most hideous thing that I heard that the Lep's did was to record every note of every chord individually to get a "fatter" sound. Can't remember which songs, but that's the legend, pretty scary stuff...
It would seem that Mutt must have some kind of speech impediment if it was he who influenced the vocal inflections on the less-than-classic "Pour Some Sugar" ("Peww Sem Shewgeewwown meuhhh!!!"). Harharhar!
Good ole' mutt.