I'm a bit experimental with bass building and revamping. I have a jazz bass in which I routed out the bridge pickup to fit a MM style humbucker. I installed a 2-band active preamp. Here's my dilema. I have both a bartolini Jazz bass neck position pickup and a bartolini MM style bridge pickup. I have everything wired correctly (so I think). I'm getting good sound out of the bass however I notice when I turn the blend pot to only have the neck pickup (Jazz pickup) on, play a note and bend the string; the volume kinda cuts out when the string is bent. It's weird. It's kinda sounding like a wah, flanger effect. Any reason as to why this would happen. It doesn't happen when I put full blend on just the MM pickup. Do I just have a bumb neck J pickup? Any ideas? Thanks for your help.