I have a Daisy Rock "Rock Candy" bass I use in a Chicago/Traditional blues band, has active pickups and the feel of a Fender Jazz but much lighter and well-balanced. Confused on what the 4 knobs do, 2 lower ones and 2 upper ones, the two bottom and bridge side upper have detent, the neck upper does not. Probably like a Schector since Trish's husband runs Schector and they seem designed the same. I know one control is overall vol, one is blend of pickups, one is 12 db treble cut/boost and one is 12 db bass cut/boost, please help - rude comments are o.k.; I should know this stuff !