Passive LPF and HPF circuit

Hey folks, I'm just dipping my toes into designing my own circuits so I could use a little bit of help here. I tend not to put tone or volume controls into my guitars, preferring the pickups to go straight to the jack, maybe via the selector. Occasionally this leaves the guitar with too much treble, and for lower tuned guitars they could benefit from less bass on input too. I've designed what I hope is a passive HPF with optional 2nd order mode with variable cutoff frequency, with I hope correctly utilized dual gang pot. This feeds into the LPF. Would this circuit work? Are there egregious mistakes?

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