The pick-ups and active 3 band EQ electronics are custom made by Bill Bartolini. The controls are: master volume, a pick-up pan pot, treble, mid,(push pull 250/800), bass cut and boost, with center click (from neck to bridge). There is a blend pot in place of the normal 3 position switch. The blend shifts from the regular magnetic set up to an all piezo Ghost bridge system, and anywhere in-between. The EQ also shapes the piezo output too, so a huge variety of tones available.