Today I installed a tbx circuit on my Fender p bass special deluxe. Made a big difference in the basses tone. Few reason why I did this modification is I like my tone not only being deep thunderous and chest pounding, but also being very clear and bright with a growl. The stock pot was duller sounding and I just wasn't happy with it. Duff McKagan being a big influence on me also has the tbx on his signature bass. I really like the tone of the duff bass so that's how I made the decision on what to go with. Very happy with the tbx circuit