The "Blue Stripe" Mark III is considered to be the most aggressive Mark Series Boogie ever introduced. The presence cap and voltage rating of some of the orange drops in the power section were also altered to mirror that of the IIC+The Mesa Mark III introduced a third channel, a crunch rhythm sound right in between the rhythm and lead channels. A dual foot switch system that alternates between the current rhythm mode and the lead mode, and the other selects either the clean rhythm mode or the crunch rhythm mode. The two rhythm modes share all of their controls, while the lead mode only shares the rhythm modes tone stack, featuring independent gain and master volume controls. The physical switch for the crunch rhythm mode was implemented as a push pull switch above the middle frequency control with a presence and reverb on the back.