All KellingSound controls are pretty much custom made. This one was made to the specs below.
J Bass Harness, 250k Volume pots with treble bleed caps. 500k push pull tone pot: In down position it works like a normal tone pot with a .1 cap for more bass. In up position it has two more settings, on 10 is a mid boost, turned to 0 it scoops the mids. This gives you 3 completely different tone settings. This is also solderless. You only need a small screw driver to install. All harnesses come with a jack.
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$40 shipped free USPS