so, i bought one of these to install into my warwick thumb5 now, the aguilar "instructions" don't mention how to hook this up to active pickups. where does the power to the pickups come from? the battery? positive or negative? how do the pickups switch on/off? also, can i run 18v into my active pickups? they are obviously meant for 9v, but this aguilar preamp wants 18v. do i send just 9v to the pickups & 18 to the preamp? ugh... i get crappy tone, lots of buzz and it's all distorted.. hellp!!