What I want to do is probably very simple, but I don't understand how wiring pickups work, but I can follow a diagram ok. I have a Vintage Modified Precision and I've replaced the stock P pickup (which suprisingly was Alnico) with a 2015 American standard Precision pickup and the bridge with a Vintage noiseless Jazz bass pickup. The bass sounds heaps better, and I'd like to try having a master volume and a master tone control, but I haven't been able to find a diagram. Can anyone help? Many thanks.