'ello Marshall Fam! Please take no offense ( and this is IMHO) but that (T) dial takes the cake for adding horrible, sizzle. That knob just doesn't benefit me on any of my Marshalls ( DSL 50,100, SLX 2500, (6) 3210s, (1) 3315). At most I can add a VERY fine hair (1-2) before it sounds like a crackling AM radio. I swear that knob is why I own a good amount of y'alls Marshalls. Lol A juicy, beefy and punchy Marshall ( to me) sounds best at Presence (9), Mids (7) Bass (7) Treble ( 0 ) through fatty G12T75s. Edit: Presence and Mids shift Marshall to Marshall. The dials will sometimes never move on either.