Hi, I recently purchased a Rogue LX405 5-string bass. The specs say that if you pull up the volume knob, it cuts out the battery, and allows you to play without a working battery. This does not seem to be the case. If you don't have a working battery in place, you get no sound, regardless of the volume knob being pushed or pulled. Is there any way to fix this so that I'm not totally reliant on the battery? Someone suggested that the bass was designed to have a different type of output jack that takes the battery out of the circuit when the instrument cord is not inserted. Thanks!