I have a question I hope someone who has experience with this can answer. Has anyone mounted a J style pickup very close beside a large MM style humbucking pickup? Was there any degradation in the sound of either pickup because of possible magnetic interaction between the two pickups? I was thinking of adding a J style pickup in the standard neck position on a bass that is equipped with a MM style humbucker in the standard MM position. I measured and doing so would put the J pickup about 1 inch from the MM pickup. This would not involve blending the pickups. I'd have a switch so it would be one or the other using the existing passive volume and tone controls. I'm just concerned that there might be some magnetic leakage that might degrade the sound of either pickup. I know there have been basses with some pickups stuck on very close together, like Bootsy Collins basses and the Fender Urge, but I don't care for the sound of those basses. I just want to be able to switch to the sound of a soloed J pickup in the neck position and have it sound as good as possible, without also degrading the sound of the existing pickup. If anyone has any thoughts on this, I'd like to hear them, before I get the router out and start hacking.