I found a Premier Guitar article discussing Leo Fender's Passive Treble, Bass cicuit from his days at G&L and though it sounded pretty cool. I installed it on my Jagmaster and the results are pretty underwhelming. Part of that is my own fault (maybe all of it?) but I need some help figuring out what's going on. Here's the diagram I used: The author points out that this isn't the exact circuit Leo used but it accomplishes the same effect (at least as demonstrated in the author's video). I normally use a .022uF cap on the tone control of my guitars but I didn't have any around. I did have some .047uF caps and that's what Seymour Duncan always calls for in their wiring diagrams. I figured if it's good enough for them it's worth a try. The sweep of the tone treble control is WAY more dramatic than what I'm used to. Should have stuck with what I've always used in the past. My bad. Not my bad; when I wired everything up as shown in the diagram I found that the sweep of the treble pot was reversed. I fixed that. More bothersome is the effect of the bass control is so subtle it's almost imperceptible. This is unexpected since I used a .0015uF cap as called for and the alternate suggested values are for even less bass cut. The only thing I did differently from the diagram is I grounded the back of the bass pot to the other pots. The author says it's not necessary but I guess I just thought I would do it for good measure. I don't think that should matter but since this didn't turn out as hoped I'm putting it out there in case someone more experienced than me sees it as a problem. Also in the interest of putting everything out on the table, here's the diagram from the same article of the original G&L PTB circuit. According to the diagram Leo used a reverse log, 1 meg ohm pot with a .0022uF cap for the bass control. If anyone can offer some tips or relate their experience using this tone circuit I would greatly appreciate it.