The past few days, someone else's shoddy work installing pickups on my Sheraton II has bit me in the behind, and now I have to rewire the pots and caps. To which I have been listening to any video I can find on YouTube regarding PIO, .022uf, K40-9y, K42y, etc. ad nauseum. Let's include Orange Drops, Mallory 150's, Sprague, Vitamin, Q, T, XY & Z. I cannot here a difference between PIO, Polyester, Poly-Mylar, and some ceramics. I can here a discernable difference between all the above and tantalum, with the tantalum really being poor. I challenge anyone to not only say there is a difference in the tone of the different types of materials in the capacitor, but explain to me why there is a difference. There shouldn't be, simply because of the physics involved in filtering the sound in conjunction with the pot. Material shouldn't have a bearing on it - yet I read a lot of insistence that it does. Does it? I dare you to explain why it does.