Hey Peter , Thanks for the assist . The bass was purchased from ebay , in fact the one thats recently posted as Do not think it is a Mark King but so there are plenty of photos to reference . The switch in question is the one closest to the input jack which in the Europa controls would be the LED switch . This switch however is a three way type and only functions in the downward position . When repositioned there's plenty of crackle but dead silence when settled in to the next position . The bass with it's flamed koa top is a looker and plays well . It appears to be pretty much a closet cherry and theres almost no wear with great tone . Still I would like to know whether it's truly a Mark King or just a custom build as well as what the switch in question is for . Thanks ,
Patrick