I want to use a piezo transducer to make a contact pickup for my guitar. I am using a schematic found from Make Magazine to create a little preamp. Also, I want to install a potentiometer to control the volume of the pickup. Quite frankly, Im not sure what resistance pot I should buy and where to wire it. Im sure this is a very straightforward question, but I just don't know enough about electronics to confidently put it it. Ive attached a diagram of the schematic for the preamp. All the components are marked on the schematic. Thanks for the help!
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