Welcome to LTG! The white switch is the pickup selector to chose the pickup that you want "active" (the middle position is both pickups active). The knob next to the pickup selector is the volume control for the neck pickup (it's labeled "Vol"). The knob directly above the output jack is the volume control for the bridge pickup (it's also labeled "Vol"). The last knob is the master volume that affects the tone of both pickups equally (it's labeled "Tone"). The mini-toggle switch is a phase switch that puts the pickups out of phase when both pickups are active at the same time (when the white switch is in the middle position). The sound is a little thinner and nasal. A good example of this tone can be heard on "Sultans of Swing" by Dire Straits. Hope that helps.