Audible illusion L1

Anyone who owns this L1 model should be familiar with the 4 dip switches on the circuit board, i bought a used L1 with no manual,i read this information somewhere and i dont recall that those switches are for cutting in and out the capacitors on the output signal path,can someone confirm? also if the switches are in off position are those caps being bypass? or the other way? All info's and responses will be appreciated, thanks in advanced!
Best
Tim