Parts

4 knob system features a pre-wired balance control (blend) and master volume with both the bass and treble on a concentric pot as well as the mid-control

4 knob system for passive pickups features a pre-wired balance control, master volume, stacked bass and treble and stacked mid-control

5 knob system for passive pickups features a pre-wired balance control, master volume, separate bass and treble pots, and concentric mid-control (stacked)