I've just finished putting together a bass I've been working on for a while, and now I think there's something wrong with the electronics. I've got a Carvin active/passive bass module, a Carvin HB5 at the bridge and a Carvin stacked humbucker at the neck. The main volume knob supposedly pulls up to turn on the active module, while pushing it down puts it into passive mode. However, it only produces sound when the active mode is turned on, the active mode plays without the battery in, the bass is extremely quiet when I plug into the active input on my ampeg, and none of the EQ knobs seem to affect the tone at all. Anyone know what's going on here?