Just got back from Brian's shop and made my SCD6 passive with Vol/Tone Vol/Ton, series/parallel mod... So I don't need the pre any more. It has Treble (Add/cut), Mid (Add/cut), Bass (Boost only). Info about the pre is located here: http://www.benaventeguitars.com/2009benavente/accessories.html Benavente Preamp The Benavente 3-band is a hand wired custom EQ system designed with the player in mind. The unique feature about this preamp is that at center detent, there is absolutely no preloaded EQ curve. There is absolutely no tonal differences between switching from passive to active at center detent. This allows the player to have a true flat starting point with the instrument and an understanding of the instrument's natural tone. Almost every other preamp on the market is loaded with an EQ curve at center detent so you never hear the true tone of the bass. The preamp is available with bass, treble and midrange controls. The preamp opperates at 18v and will fit inside nearly any rear routed bass. The Benavente preamp is designed to give the player the ability to be as aggressive or melodic and full control over the instrument ability to speak. $50 shipped.