Walrus Emissary Parallel Boost[em uh ser ee] Anatomy. Sending or coming out, as certain veins that pass through the skull and connect the venous sinuses inside with the veins outside. Built from the ground up, Walrus Audio has developed a new 2 in 1 boost to help make leads stand out, slides sing, finger picking come to life and to push tube amps into great natural breakup. Like the veins its named after, the Emissary Parallel Boost features two independent boost circuits running