Adjusting the range of a tone control

[spargo]

I'd like to adjust the range of a tone control on a pedal. Specifically, the tone control of a Bluesbreaker.

In the regular Bluesbreaker build, the tone control does nothing from a full counterclockwise turn all the way to 2 or 3 o'clock. The full range of its effectiveness is from about 2-5 o'clock.  How would I make that adjustment range spread out to the full turn of the knob?

It's a 25k linear pot in the schematic.  Would it be as simple as putting something like a 20k resistor before the pot and switching the pot value to 5k? I would think this would make it so you're always getting that first dead range, then able to tweak the rest with the full range of the smaller value pot.

[Hides-His-Eyes]

That would do what you describe, yeah. Do you want that quarter turn and then some more available though?

[spargo]

I don't really want WHAT the knob adjusts to change.  I just want to be able to use the full knob to make the change. By default, 3/4 of the turn is useless and does nothing. So I don't want it to make a more extreme EQ cut or boost, just use the full knob range to do what it already does.

[Steben]

linear feel in other words.
Sometimes a linear pot ought to be logarithmic to feel linear.