NS Designs JackPot&trade; Rotary Potentiometer True Bypass Switch, 500K With the JackPot you can play full on, with the pickups wired directly to the output jack. You'll still have a trusty volume knob to back off instantly to a lower level when needed. The JackPot produces a stronger signal level, greater warmth, more intensity. On typical instrument wiring, when the volume knob is maxed out, there is still a portion of the signal that bleeds to ground. The output level never reaches the full level the pickup would achieve if it were wired directly to the output jack.