SKEW: Adjusts the frequency response of the boost, which also slightly affects the gain. When dialed fully counter-clockwise, you get full range and max gain. When dialed fully clockwise, you get the stock setting of the original H-S Treble Booster.
BOOST: Adjusts the amount of boost. Stock H-S setting is about 2/3 up.
EXTRA: Adjusts level of gain extracted from the transistor. Crank this setting to get rowdy.
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