I have a Heritage H-150CM and have a question about the wiring. Lets say I have the selector switch in the middle and both volume knobs all the way up. If I lower one of the knobs below 10, I heard a very soft click and that pickup is then disengaged. So, If I have the bridge on 10 and the neck on 9, it'll sound exactly the same as if just the bridge pup is on. If I have both pups below 10, I can blend them and when they're both at 10, they're both on as well. Is this normal? Also, when I have either volume knob on 0 and start to increase it, I can hear a slight crackle right before it comes on. Could I have a wiring problem? I've only had the guitar for a few weeks and bought it new with Seth Lovers.