I've located a bunch of different .047µfd paper in oil caps that I'd like to try in some of my instruments. Does the voltage rating matter on any of these with regard to the use in a guitar (particularly a single coil strat)? I found some .047µfd Vitamin Qs but they're rated at 100volts. Don't know if that's a good or bad thing. I'd seen most guitar caps rated at like 600volts or so. One other thing. At the risk of seeming stupid... what does "µfd" stand for? Thanks.