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The circuit and a photo of the MRB control is here:

http://www.voxshowroom.com/us/amp/RG_FSconnectors.html

It seems to be a rotary switch. I can believe that the pot had a significantly lower unit price than the switch, especially if the amp used lots of pots and only one rotary switch, or if the rotary switch was custom made.

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Yeah tried to mention that in my comment. You were switching between 3 physical caps, but the transistor(s) in the wah circuit let you use a potentiometer to alter the way the cap reacts in the circuit by reducing the sheer number of electrons that even get stuck on it.

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