Looking for remote volume gain that will do 4 channel amp

[94 ranger]

Just like a subwoofer remote bass knob I'm looking for a volume control to essentially use as a master volume in between the RCA to amp.
My headunit uses capacitive touch volume which is entirely aggravating and not exactly responsive to the touch while driving and needing to cut the volume down in an instant. So I'm looking for a gain knob that will do 4 channel amp . No line drivers no dsp installed just a way to master Volume control with a gain knob.

I've also seen the wetsounds solutions Bluetooth rotary volume/ track skip item but I don't think that has the ability too adjust volume just but being constantly on bluetooth.

Best way seems by remote gain but I can't find a 4 channel in 4 channel out gain knob.

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[1aespinoza Premium Member]

You could use an active equalizer. Some have a rotary master volume. Mine is a $60 Clarion

 

[nauc 10+ year member]

that Clarion eq is good. i used it for like 10 years

 

[1aespinoza Premium Member]

that Clarion eq is good. i used it for like 10 years

I've had mine about 5 years. Still ticking.

 

[optimusX]

You could use an active equalizer. Some have a rotary master volume. Mine is a $60 ClarionView attachment 21941

That looks real nice and the size seems just right.