that depends how it's set up in the lincoln. if it's a seperate control then should be, but if it's a feature built in to the headunit then prolly not. also depends what type of control it is. if it's just a potentiometer then it's not gonna make it any louder than what it is with the current setup. it will just give you the ability to turn it down if you want. this will also be effected by the bass control in the headunit. if you turn down the bass in the headunit then the output to that switch will most likely be matched to that setting and you won't be able to make it louder with that extra control.
would need to do some more research to see what's possible.
2010 Volvo C70
2011 Harley FLHTK
Midwest Crew #22