Dustin Kensrue's Stingray Switching

[TripHazard]

OK, can anyone explain the switching on Dustin Kensrue's Stingray to me?
What is that little lump on the top corner of the pickguard - lower bout?

I think the guitar looks ace - any chance this pickup configuration might become on option on the Stingray in the future BP?

 

[GWDavis28]

OK, can anyone explain the switching on Dustin Kensrue's Stingray to me?
What is that little lump on the top corner of the pickguard - lower bout?

I think the guitar looks ace - any chance this pickup configuration might become on option on the Stingray in the future BP?

Looks like some kind of switch.

I like how he has the dual volume and tone in one stackup and that the switch is moved from the top of the horn.

Glenn |B)