I would like to ask if anyone has installed the Aguilar OPB-1 Preamp in their bass and still has the instructions. I would like to know if you still have the instruction sheet that you could copy and fax to me or mail to me. I want to install one in a custom build that I'm having done and I want to know my options. Will it require any concentric pots? Can I add an active passive switch? Please get in touch via e-mail. Thanks!!