Master EQ controllers

I got reminded by the couple of recent threads related EQ.
Does anyone have a couple of physical controllers permanently set up for EQ, say hi and lo?
I was at rehearsal and someone said oh could you turn up your treble a bit. I found it wasn’t that easy.
I’m thinking of now running everything through an EQ to have this feature.

Thoughts?

Ah. Should have searched first.
Plenty of mentions of master/output racks etc.