hi, last night was the first gig with my new sx p/j. i dropped in a quarter pound P and kept the factory jazz pup in there. i noticed that the bass wasn't very loud even with the gain and master pretty cranked. so i turned down the neck pup and it sounded super quiet. i turned the neck pup up and turned off the bridge pup. BAM! plenty loud. rolled the bridge pup back up and it got weak again. i know very little about electronics. does this problem sound familiar to anyone? thanks in advance!