Up to 20db extra gain in a push-pull pot.
it's the same device/function basically as a "clean boost" pedal, look up some of those pedals , it might have more info what you use an afterburner for,
but basically with a tube amp you can pull this on then spin up as much extra overdrive you want.
the ltd vb-300's used to come with this stock and i dug it, it let me sweep in distortion while letting a chord ring out.
they work with active or passive pickups.
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