two pots are the volumes for each of the pick-ups.
you have a rhythm/solo switch that is like a boost, it shorts out the cap giving you more volume.
the other two switched switch on and off the pickups.
there is no tone controls on a hofner beatles style bass.
Epiphone EB3, Yamaha RBX 170. LE.Marquis.NY,
Harper 5 sting fretless, Rockenbetter 4003.