So my dad bought this used Epi LP standard with an DiMarzio super distortion in the bridge. The thing is when the pickup selector is on both pickups you controll the volume with only one of the volume knobs (both work) but they are supposed to work individually right? His Washburn HB-30 works that way (individually), so can it be that there is some messed up wiring going on?
Maybe the previous owner wanted a master volume?
Nop, they don't. On the middle position you can't control each coil, you control both at the same time. So, if you have one vol knob at 0, you can't hear anything.
It has to of been an over-ride wiring of some sort so the previous owner can use it as a master volume but only on the mid pup switch position.