I was reading an add in Reverb where an owner of a Sandberg Electra VS4 (P bass model) mentioned that by pulling the volume pot, it turned off the pre-amp for passive mode. Mine is a little over 1 year old. I've exchanged emails with Mike at Sandberg who explained that they discontiued that feature and that I could either install a switch or pot with a switch. I have asked for a schematic but thought it might be easier to see if anyone has this model and can take a look at the circuit. BTW, these Electra's had the wood fabricated in Korea and then assembled in Germany. Super high quality for a great price. None of the US dealers stock these anymore. Wonder what happened?