Bartolini 4.5 pre should arrive today! Looks to be a direct swap with some minor pickup lead soldering and desoldering the included output jack so I can use the stock locking neutrik jack. Anybody else done this swap? Is it as easy as it looks? BTW, I solder circuit boards for flight controls for a living, so the soldering will be pretty routine for me, other than not having access to my good irons at work... Preamp installed, but now I'm trying to figure out the pickup wiring. 4.5 pre with active/passive switch. Vol/Blend/Bass/Treble... Two wires from each pickup, a red and a black. I am pretty sure these are US Bart pickups. I know the black go to their corresponding place on the blend knob. Where do the red go?