Quintet Tone Curve Board w/o switch. Passive module to be built into your guitar or bass that permits you to select among 5 different frequency response curves to be applied to your existing guitar sound. Only works with passive, magnetic pickups in guitars, steel guitars and basses. Greatly expands your tonal range. Can be connected to your own switch, either rotary, blade (Strat-type), toggle, push-pull or push-push to select among up to 5 different tonal response curves, or can be hard-wired to blend in a single curve of your choice with your tone control as the blend knob.