A simple 3 button Aux switch, wired with Diodes for the 3rd switch, with the footswitches offset. We can put a taller footswitch in the center as the example product shows, or make it the same height as the others.
Dimensions:
4.8″ (122mm) Wide
1.5″ (39mm) Deep
1″ (25mm) Tall (with footswitches extending above).