I'm putting together a new bass and am trying to wire it up with 2 humbuckers, 2 volume and 2 tone knobs. Issue I'm having is that when only one volume knob is turned up, I get nothing. I have to turn the other volume up just a bit to get any sound. Volume pots: 250K Bourns Tone pots: 250K Bournes I'm using a .49uF 50WVDC Cap on the tone pots. I've wired it up the same as this diagram except I don't have the pickup selector switch in there. I've soldered both the positive leads to the tip ring on the output jack.