no idea -- you can buy the pots alone: Goodrich Pot | Online Store - Steel Guitars Of CanadaWell I'll be. I was under the impression for a long time that they were optical. But when I search for "optical volume pedal", the only thing that comes up is Morley. Not to take anything away from the build quality, and chassis design, but the pots are something quite special. I wonder if the taper is also appropriate for wah.