Here's a incredible Audere Preamp which you can retro fit into a Jazz Bass.   Comes mounted on a jazz bass chrome plate.   You can take the knobs off the plate for rear routed instruments.   Has a phenomenal selection of tones. Have a read about how it works here - it's quite clever! https://www.audereaudio.com/pro-jz3d-vb-2b-chrome.html Controls:   Volume Blend Stacked Trebel and Bass 5 way selector switch.   Doesn't loo