|The US Vox V1031 and 1032 solid state Cambridge Reverb included this accessory three button foot pedal. This pedal controlled reverb, tremolo and MRB (mid range boost).
The MRB foot switch is unique in that it does not have a latching mechanism. It is a "momentary" style switch. One must hold the button down to engage the effect. When you release the button, MRB is turned off.
North Coast Music offers the exact replacement switch mechanisms, cable, six pin connector plugs, V1031 and V1032 Cambridge Reverb wiring schematics, and even the special spanner style nut used to secure the switches. Click here to go to the web page in the North Coast Music web site that offers this foot pedal and replacement parts.