I envy you!!

Sweet!!!!
A gorgeous 1959 Jazzmaster with gold anodised pickguard rests on a vintage 5E3 Deluxe. Not a bad
Rig.........
When the switch is in the ‘up’ or ‘on’ position, the neck pickup is singled out, then routed through a separate set of controls consisting of a 1 meg volume and a 50 kilo-ohm tone paired with a .02μf capacitor. The major difference between this and the standard controls is the 50k tone pot, which is like taking zero through two from a standard tone knob and using that as the entire range of high-end roll-off.
When it’s time to step out for solos, the user simply disengages the circuit, activating the brighter and more familiar control layout: a toggle selector switch for both pickups, 1 meg volume and tone controls, and a .033μf tone cap. All of this works exactly as you’d expect on any other guitar, which is perhaps one reason the additional controls never caught on.
The Jazzmaster’s rhythm circuit has been maligned and misunderstood over the years – they’re far more than just ‘mud’ switches if you know how to use them.
guitar.com