I have a 2001 US standard P-bass. It has a good sound, but when i play it has a small popping sound. It comes when i pick with my fingers, just at impact. I am resting my thumb on the pickup, when i play at the neck (i don't prefer this) The popping sound disappear. If i uses a compressor some of the popping disappears. This is not a problem at all, when i am using my J-bass. So can this be related to pickup height, strings etc ? Or do i need to change my playing style ?