alright so its very simple and it just takes one solder. you need to connect the the neutral wire from the neck pup to the live wire of the bridge pup. for this you need to de-solder the wire from the neck pup to the ground on the neck pot and the live wire from the bridge to the and connect them. you get the idea?
this way the neck pup volume knob will be your only volume knob. the bridge pup knob wont work anymore and tone knob would stay normal! i did it in like half a minute and i loved it. moreover it only takes another minute to put it back this way if you dont like it
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three steps:
1. remove the black wire from the neck pot shell
2. remove the white wire from the bridge pot lug
3. solder the two of them together!
your bass might not have white or black wires but you'll know by where they are attached. shell=ground/neutral wire, lug=live
Great! Thanks!!