I posted this over on The Dude Pit, but thought some folks over here may be interested. I was looking at the drawing and thinking about what the switch really does... http://www.glguitars.com/schematics...tic_drawing.pdf There is no way to wire in a capacitor to provide a bass boost in a passive circuit. I was looking at the switch and this is what I get. 1. Pickup coils in parallel. Just what they say it is. 2. The yellow is connected to the black which is connected to ground (the cap is shorted out by the switch). Classic single-coil mode by shorting out one coil. Again, just what they say it is. 3. Yellow and black are connected. These go through the .1 cap and then to ground. This puts the coils in series, with the series connection going to ground through the .1 cap. So the lower frequencies act as though the coils are connected in series (which they are!) while the upper frequencies are only coming from one coil. Bam, instant bass boost.