How can I wire a doubled up Potentiometer to cut two different frequencies?

Here’s my setup:

2 Humbuckers, 1 volume, 1 tone.

Now what I want to do is make it so the Tone pot is zeroed at 5. 5 being the middle between all the way clockwise & counter. I want to cut treble one direction and bass the other from the detent. Also, I’m not familiar with which values of capacitors cut which frequencies.

I plan to have the volume pot be at least a 500k pot. Does that mean that one half of the doubled up pot would need to be at least 1 meg and the other 500k?

Wiring a guitar is not foreign to me, but tweaking tones using caps, resistors & potentiometers with different values are.

I doubt anyone on fluther would be able to help with this, but I thought I’d at least ask since I really can’t grasp the concept via google.