For my Fender Jazz fretless I am considering some sort of preamp. This bass has Bartolini 9W4Js in it. I'd either consider something onboard like the little Aggie OBP, or something like the Sadowsky outboard deal I have for my fretted Jazz (it's the old clip model, and I tend to clip it to my strap, so using it on multiple basses at one gig is tricky). Of course there is always the J-Retro that seems to be well-loved around here. Anyway, any suggestions are appreciated!