So, i have the Geddy Lee bass. I have already changed out the pickups for Seymour Duncans. And now im looking to put in a preamp. What i want is two volumes, and a bass/treble boost/cut stack, with the ability to revert to passive. What ive looked at are the Aguilar obd2, and the Bartolini. These two are right in my price range and id like to know what the tonal differences between the two are.