Whoa! What do all the controls do?
To be honest with you it's been so long since I've played with it I don't remember!
The thing about the B-402 basses is they have active electronics it them.
If I were to hazard a guess, I think the two large black knobs are neck and bridge pick-up volumes.
The two small black knobs are the treble and bass boosts.
The top two toggle switches might be for turning the two pick-ups on and off and the lower one might be a phase switch.
Now I might have to retrieve it from the vault and find out!
<I know it's in here in the bass section somewhere!>