Hi, I'm pretty new to this area of electronics and was wondering... On my squier vm jazz bass there's the standard two volumes and one tone control, I have also got bartolini pickups installed on this bass anyway is there a way of upgrading my eq options on my bass I preferably want to have a stacked eq (treble/bass) and then the ordinary two volumes. I have no idea where to look what to look for what's good and what's bad when It comes to these things and id love your help. One more thing can my solution be passive? Or will it have to be an active upgrade? Thanks!