I have no idea what I am doing
I was just approached by my roommate about this new bass he got. It's an Ibanez sr406 that has been modified with an Aguilar performance obp1 and a second nine volt battery connector wired in series with the original connector. It has had the "middle" knob that has two knobs, one black and one silver, cut out of it. He wants the knob soldered back in. I have no idea what I am doing. I need suggestions. Pictures of the guitar and the wiring are provided. Thanks in advance.