A simple 3 button Aux switch, wired with Diodes for the 3rd switch
Dimensions:
167.00 mm (6.575 in) Wide
37.00 mm (1.457 in) Deep
20.00 mm (0.787 in) Tall (with footswitches extending above; total height from bottom of enclosure to top of footswitches: 33.671 mm (1.326 in))