I'm sure I'll sound like I don't know what I'm talking about but here goes... I was wondering if the preamp on my Epiphone AEB (I guess that what is, it's the controls for the pickups but is not powered) can be replaced with say a Fishman easily. Are those standard sizes or do you have to alter the bass to get them to fit? I would not dream if attempting that but I want to possibly replace that or buy a preamp pedal or something. I'm trying to get a stronger signal to send my amp. Thanks!