Lehle Mono Volume S
The preset 4 and 4.1 has a very progressive taper
This works very well with heavily saturated amps and fully overdriven pedals.
You can easily change the amount of gain, even down to nearly clean, because of the progressive curve with your foot you have the feeling of a linear travel
Signal Chain, Fender Stratocaster into the Shnobel Tone Daily Driver into the Lehle Mono Volume S into the TC Electronic Alter Ego X4 into the Vox AC30