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1. The second volume control (for the straight/back set of pickups) hums when I turn up the volume.
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The back pickup (known as the bridge pickup, since it's closer the bridge) is a single coil pickup, meaning you're likely to get
a slight bit of hum at full volume...
Did it hum when you tried it out in the store? Does the hum level change if you turn the bass, towards or away the ceiling lights? A little hum may not indicate a problem, and sometimes it is exacerbated by lighting/electrical work nearby. If it's a consistent (regardless of location and amp) noisy hum that overwhelms the sound of you playing, that's a problem that can be fixed.
Do you have any bass-playing friends who can check it out? Someone should be able to tell you right away if it's a normal hum or if something is wrong. Get a third party opinion before taking it back to GC, so you can push back in case they question you about the problems.