Or an EQ bypass switch. I have a bass with active pickups and the switch bypasses it, it’s never truly passive.
Or the Boxer style TBX tone control, where 1-5 acts like normal tone, with 5 equaling full; and 6-10 scoop the mids progressively. Yes it’s passive, no batteries.
There’s probably some other circuits we haven’t mentioned. But for the majority, flat for EQ is middle, for tone is full.