Wiring Question

[Greg Robinson]

Scott, Mark's right on. At the voltages we see in guitars, 2 different types of capacitors of the same value will sound the same. With higher voltages and currents like those in amplifiers, the non-linearities of different dielectric materials can have a pronounced effect on tone, and many people expect this to translate into the passive circuits used in guitar tone controls. Really, any film type, ceramic or other non-polar capacitor will work equally well for a guitar tone control, and it only need be rated for around 10 volts, but it is uncommon to find any non-polar capacitor with lower than a 100V rating.
Personally, I never use ceramic capacitors in guitars, as they exhibit piezoelectric properties, and can become microphonic. I usually use metalized polypropylene "greencaps", they're cheap and commonly available, and work just fine. The orange drops and bumblebees etc do look very fancy though, so it can be nice to use those sometimes, even if it makes no difference to the tone in this location.