The Markworld Footswitch Dual can be used with the Big Bang, Little Marcus series, Little Mark Vintage series and Little Mark IV heads and combos.
For the Big Bang Head one button on the Dual Footswitch controls the mute function (allowing you to tune silently), and the other activates the filters section.
For the Little Marcus the two switches allows to turn ON/OFF the EQ1 and EQ2 sections.

Compatible also with the discontinued Markbass TA 501, TA 503, MoMark LMK, Studio Pre and DV Mark DV Little 40, DV Little 40 II and Maragold.