I've been doing some research as I want to upgrade my Warwick Corvette $$ buck 4 string. I'm leaning towards the Aguilar OBP 2tk pre. I just looked into John East J-retro. That preamp really makes me want to change out my Fender Jazz 4. I've looked at Lane Poor to upgrade my double humbucker pups in my warwick and maybe my jazz, while scrolling through there site, I notice the have an On Board pre. I couldn't find any videos or threads online. Anyone has any comment on these?