This is Fuzzdog's clone of the Xotic BB Preamp. https://shop.pedalparts.co.uk/Big_Beefy_Preamp_-_Boost_and_Overdrive/p847124_10530483.aspx It's the guitar version but  has the 'more bass' caps mod and also has a clean blend: https://shop.pedalparts.co.uk/Blender_-_signal_mixer/p847124_8681943.aspx Put together by my electrician friend.  No knobs but I can probably throw in some 'Marshall' style ones, if you don't have any. Slightly bigger (taller) enclosure than strictly