I have a couple of Fender Am. Special basses and they have the “Greasebucket” tone circuit. I find that I like it in those two basses and I copied it and used it in an old ‘73 Jazz that I put some Nordstrand pickups in, using the NJ4SV in the neck and the NJ4SE in the bridge. I found that I really like this combo of pickups and that circuit and plan on trying the reverse (NJ4SE in the neck and NJ4SV in the bridge) in a ‘75 Jazz I also have. My question is: are there any other interesting passive tone circuits that anyone is aware of? I know the greasebucket is a variation of another Fender experiment called the TBX (I think), and from the descriptions I have heard about that one, I’m not sure I would like it. One thing I can say is it seems I’m always trying to get the low mids to come out without getting too much low end. I guess the best description is, I find my Rickenbacker to have great tone on the A, D, & G strings, they really cut through while on my two pickup Fenders, sometimes notes on those strings, esp D and G strings, will sound a bit small/thin. I don’t know if that can be remedied with a tone circuit, but either way, it’s fun to experiment.