I've heard some good things about the J Retro preamp. Can someone tell me the advantages of having a J Retro installed in my Jazz bass? Is this just an easier way of tweaking my tone without having to fool around with my amp between songs? Do most people that use such onboard preamps generally keep their bass amp EQ set flat, and make adjustments to the EQ from the bass? Does the J Retro sound "hi-fi" in active mode, kind of like Marcus Miller's sound? Or does it retain the organic tone usually associated with Jazz basses (just with more tone-shaping flexibility)? Any hiss associated with the J Retro? Thanks in advance for the info!